* AlternativeCharacterInterpretation: While Brainard himself seems to believe otherwise, it isn't too much of a leap to wonder if he might have a genuine undiagnosed memory disorder, especially considering the early scene where he's clearly having trouble recalling that he's even engaged, and that the rehearsal was the previous night.
* BigLippedAlligatorMoment: The "Copacabana" CGI dance number, which was pretty much just made for the trailers and to pad time.
* DesignatedHero: Professor Brainard is supposed to be "comically" absent-minded, but just comes off as a self-centered jerk.
* EsotericHappyEnding: The ending with [[spoiler: Braniard attending wedding #4 from his lab by video proxy]] was supposed to be a cute, fitting end to the movie. Didn't quite work for many people.
* InformedWrongness: Despite the fact that Phillip has just blown off a third wedding ceremony due to his absent-mindedness, the movie attempts to make it look like Dr. Reynolds' TranquilFury response - and subsequent breaking things off - to his half apology/half "But look at this cool thing I made" exhibition was an emotional overreaction.
* MisBlamed: Some of the particularly obnoxious plot elements, including abandoning Sara at the altar over and over, are carried over unaltered from the original film. Of course, one could still criticize this film for not fixing them in the first place.
* {{Squick}}: The subplot with Weebo's lust for the professor, progressing into creating a sexy female hologram so she can act out her emotions for him physically when he's asleep, and finally the admission at the end of the film that upon her death, she gave Brainard a copy of her design called "our daughter" - with modifications based on both Weebo and ''him''. In case the analogy hasn't bludgeoned you hard enough, Weebo's final thought that allows Brainard to find the file? The word ''stork''.
* TearJerker: [[spoiler:Weebo's death]]
* WhyWouldAnyoneTakeHimBack: Most women in Dr. Reynolds' position would've left Phillip and not looked back after one missed wedding, let alone '''two more.''' (Heartfelt confession of love or not.)