This installment is a continuation of the previous film. It was released Direct to Video as the previous film flopped theatrically, but performed well on home video.
Mary Lou manages to escape from the other side to the land of the living, and begins dating a student named Alex, offering her special brand of skills (read: murder) to help him through high school. But when he tries to break off with her due to all the bodies she leaves behind, all hell breaks loose (literally).
The film was written and co-directed by Ron Oliver, who had written the previous film and directed its reshoots. Peter Simpson, the producer of the previous two films, was the other co-director.
This film has the examples of:
- Ambiguous Ending: Very much downplayed compared to most examples of the trope, but given the nature of Mary Lou's powers, as well as how it isn't quite explained, there is a chance that the ending Is only in Alex's head and is Mary Lou lashing out at his sanity in defeat.
- Arc Number: The number 57 crops up a lot, since it's the year of Mary Lou's death.
- Ascended Extra: Mary Lou is the driving force behind both this film and its predecessor, but she has far more screen-time here.
- Asian and Nerdy: Played with. An Asian student is seen sobbing after not making the top of the honor roll.
- Boy Meets Ghoul
- Continuity Snarl: Despite being a direct sequel to the previous film, there is absolutely no continuity with it whatsoever. This is reinforced by a new actress playing Mary Lou, no mention or appearance of any other character from the second, none of the Catholic elements, and a different school (based in Toronto rather than Edmonton) serving as Hamilton High.
- Creator Cameo: Ron Oliver as the host of the "Social Disease" film.
- Dark World: Hell is depicted as a darker and decaying version of the real world.
- Downer Ending: Mary Lou kills Sarah, and traps Alex in the 50s. So once again, The Bad Guy Wins.
- Feminine Women Can Cook: Sarah relieves stress by spending hours baking cookies (although she burns a her last couple batches);Sarah: I don't get mad, I bake.
- Femme Fatale: Mary Lou Maloney seduces people she plans to kill or needs to do her will, more blatantly so compared to her depiction in the previous film.
- Fingore: The Ribbon-Cutting Ceremony for Hamilton High's new school gym is ruined when the principal accidentally cuts off one of his fingers along with the ribbon.
- Fire-Breathing Weapon: After venturing into hell to retrieve her boyfriend, Sarah constructs a makeshift flamethrower to deter some of its denizens.
- Give Geeks a Chance: After her fallout with Alex, Sarah goes to the prom with nerdy Leonard.
- Hand Wave: The principal’s speech dedicating the new gym not only handwaves the gym’s redesign compared to the previous film (due to different shooting locations), but also brushes off the unexplained fates and absence of II’s characters, as “vanishing students” are all in the past.
- He Knows Too Much: Shane gets killed after Alex confides what's happening to him.
- Hidden Depths: Mary Lou apparently has a very in-depth knowledge of bird anatomy, which she uses to fix Alex's essay.
- High-Voltage Death: Mary Lou kills Hamilton High's janitor with an electrified jukebox, which causes his pacemaker to explode out of his chest.Mary Lou: Momma said I'd be a heartbreaker.
- Impaled Palm: Before killing Mr. Walker, Mary Lou pins his hands on a table with ice cream cones.
- Jerk Jock: Andrew, who views Alex as a dweeb who has no place on Hamilton's football team, and tries to drive him away from it.
- A Hell of a Time: Implied, when Alex gets Dragged Off to Hell by Mary Lou one of the damned tells him it's actually kind of fun once you get used to the smell.
- Karma Houdini: Mary Lou, who not only escapes from Hell but when she goes back to Hell with Sarah at the end she seems to have gotten even more powerful and become almost like a Demon Lord with the ability to change her area of hell to her liking (in this case making it look like a 50s era diner
- Love Triangle: Alex is dating both Sarah and Mary Lou.
- Ms. Fanservice: Mary Lou's appearances have her wearing all sorts of skimpy outfits.
- Nice Girl: Sarah. Even after learning Alex cheated on her with Mary Lou numerous times she is still willing to descend to Hell to try to rescue him, and brings a makeshift flamethrower to boot.
- Numbered Sequels: With The Last Title as the subtitle.
- Peekaboo Corpse: After noticing his absence, Sarah goes to look for her prom date Leonard. She find him when his corpse suddenly falls from the ceiling.
- Prom Wrecker: When Sarah follows Mary Lou to hell in order to save Alex, she finds Mary Lou trying to enact a twisted version of a high school prom where she and Alex will be named King and Queen. Sarah tries to interrupt this in order to save Alex.
- School Grade Hacking: Mary Lou modifies the school’s grade database to put Alex at the top of his class. Miss Richards, the guidance counsellor, naturally assumes Alex himself did this and intends to confront him, but is intercepted by Mary Lou.
- Sliding Scale of Comedy and Horror: Contrasting with the other Prom Night films, The Last Kiss is pure black comedy.
- Stripperific: Mary Lou seems to enjoy conjuring up these outfits, appearing as a baker, nurse and cop. Averted with her football uniform, which is just the team uniform, bulky padding and all.
- Stock Footage: Shots of Mary Lou's grave exploding are lifted from the previous film.
- Superpower Lottery: Mary Lou seems able to warp reality any way she wants, whether it's re-writing an essay right in front of a teacher's eyes, conjuring a 50's-style ice cream stand out of thin air, or using mundane objects (like ice cream cones) as deadly weapons.
- This Is a Drill: Mary Lou kills Andrew by tricking him to try to catch a football that turns into a drill mid-throw, which impales him.
- Violently Protective Girlfriend: Sarah turns out to be one.
- Yandere: Mary Lou to Alex. When he picks Sarah over her she says the If I Can't Have You… line verbatim and tries to kill Sarah.
