The kids thinking Mr. Holtenwasser was a Nazi despite being a Holocaust survivor actually does have some basis in reality even setting aside just plain ignorance, in that the true extent Holocaust was coming into light with most history classes saying otherwise at best downplaying the atrocities to just the groups that'll cause them to actually give a shit at worst blaming the Jews for it. So it's not entirely their fault that the kids misunderstood him.
Kevin's constant squinting isn't just a character design or due to drug use. Season 2 reveals he actually needs glasses.
Despite Kevin being a Hormone-Addled Teenager, he makes sure he has a condom ready when he planned to have sex with Haircut Girl, because an earlier episode reminded us why Frank is a Jaded Washout.
When people remember the old White House beer jingle from the 30's, their renditions sound almost nothing like the actual melody of the classical piece it's based on. In real life, people often remember songs as being faster than they actually are. Or, White House sped the tune up. Either way, it makes even more sense than stated that it takes Frank so long to find "Box 16."
Stan's hatred over Frank isn't just because of his over the latter's Irish heritage or knocking up his daughter who was college bound. Unlike himself, his son-in-law was able to marry his true love while Stan couldn't.
In season 2, Vic reveals to Kevin that he too was a victim of statutory rape because he had sex with an older woman when he was 14 and received a handjob at the same age. Considering that one of the symptoms of Rape Trauma Syndrome is hypersexuality and over-promiscuity, which is used by victims to reclaim and reassert their control over their sexuality, his past as a rape victim recontextualizes his promiscuity as something more pitiful than impressive.
Nguyen-Nguyen's reluctance to go to the authorities is likely not just because marital abuse was more accepted back then and left women with fewer options to escape, especially for a foreign-born woman who had been effectively isolated. Nguyen-Nguyen knows that she would possibly be deported back to Vietnam if her marriage to Chet, which was the likely basis for her being allowed to remain in the United States, was dissolved, and her dialogue reveals that her home and family were destroyed during the war. She has lost and suffered so much that life in an American prison is a preferable alternative to being alone in the world.
Stan mentioned his father had a Corrupt Cop buddy who framed his One True Love of a crime. There's a good chance Stan's father has asked said friend to do other dubious actions.
