Cutter realises the anomalies are even more complicated than he thought when a mobile anomaly opens, moving from a swimming pool to a reservoir to a basement. Through it comes a Cretaceous mosasaur, and even more startlingly a message from Helen Cutter. Nick goes through and finds her alive and well, but less than willing to help.
- Always a Bigger Fish: Cutter is saved from a mosasaur by an even bigger mosasaur.
- Artistic License – Paleontology: Helen tells Lester that he's the spitting image of a Utahraptor she met in the Jurassic. Utahraptor lived several million years later in the Cretaceous.
- Bunny-Ears Lawyer: Cutter assures Lester that Connor is highly intelligent, as they watch a recording of him messing about with an anomaly.
- Cassandra Truth: The police do not believe Diane when she tells them that a "Sea Monster" ate her boyfriend, Anthony.
- Failed a Spot Check: Anthony goes to up to the high-dive platform and dives off. He did not notice that in the water right below him was a large (and hungry) mosasaur. GULP!!
- Fanservice:
- Stephen's shirtless scene. Even funnier given he jokingly acts like Connor is hitting on him.
- Anthony Berton and Diane Johnson, the two lifeguards at the Crystal Palace Diving Institute. They are both young, athletic, and wearing swimsuits.
- Foreshadowing:
- Stephen saying how much Helen meant to him takes on a new significance when their affair is discovered.
- Helen saying that humanity will die out one day and something will take our place. That something being the Future Predators.
- Jerkass Has a Point: Lester allows a woman who witnessed her boyfriend being eaten by a mosasaur to be temporarily locked up on a murder charge because it's better than letting information about what really happened get out.
Claudia: We need to intervene.
Lester: We're not going to.
Claudia: And why not?
Lester: Because I won't allow this to become public knowledge! At least in prison, the tabloids can't get at her.
Claudia: So you're just going to let them lock up an innocent and traumatized girl?
Lester:
Yes it's regrettable, but the alternative would be far worse! I'll see to it that the charges are dropped when the immediate crisis is over.
Claudia: That could take months!
Lester: And would you rather tell the police that an ancient sea monster is cruising our swimming pools, consuming lifeguards?
- Hollywood Law: In real life, the lifeguards girlfriend would not have been charged with murder so quickly. The police would have a lot of solid evidence before a person can be charged with a crime. Even more bizarre is that the lifeguard is announced dead despite there being no body and he was only being missing for a few hours at the most.
- The Mourning After: Invoked: Nick's anger at Helen when they finally meet again is largely implied to be because of this.
Helen: What do you want, Nick? An apology?
Nick: Eight years of my life back would be nice.
- Not Enough to Bury: At the start of the episode the mosasaur emerges through an anomaly into a suburban swimming pool where it gobbles up the lifeguard before returning to its own time. Later it re-emerges in a reservoir where it regurgitates a bolus of its recent meal. The bolus is a blob of gore composed of material that the creature could not digest and is unrecognizable as human remains.
Claudia: Well the DNA is conclusive. It's the boy from the swimming pool...or what's left of him.
- Pool Scene: The episode opens at the Crystal Palace Diving Institute where Anthony and Diane, the two lifeguards, are enjoying an after-hours swim.
- Screaming Woman: The lifeguard's girlfriend when she sees the creature that ate him.
- Sea Monster: The mosasaur is an ancient, aquatic creature. An eyewitness even describes it as this.
- Shut Up, Hannibal!: Nick gives this response when Helen tries to tempt him into leaving the 21st century behind and travelling with her:
Helen: I offer you the key to time. The key to time, Nick! And you turn your back on it. Call yourself a scientist?
Nick: I call myself a human being.
- Swallowed Whole: Anthony Berton, a lifeguard at the Crystal Palace Diving Institute, is swallowed whole by the mosasaur when he dives off the high dive...straight into its open mouth! Because of this, nothing is left of him and the Home Office is able to hide the existence of the creature while they deal with the situation.
- Victimized Bystander: Not only does Diane see her boyfriend get devoured by a prehistoric creature, but she isn't believed and the police arrest her for his murder.
- What Happened to the Mouse?: What happened to the lifeguards girlfriend after she was arrested for the alleged "murder"? Was she found innocent or guilty? Was the case dropped? None of it's made clear.
- Workplace Romance: Anthony and Diane are boyfriend and girlfriend. They also work together as lifeguards at the Crystal Palace Diving Institute.
