Many Christopher Walken cameos can come off this way, but this takes the cake (er, pie whatever). His scene begins unassumingly enough with him playing a detective there to ask some questions, but then he starts talking about pie for no apparent reason, leaves, and is never alluded to again.
Another strange bit is when Robin, Ricki's ex-girlfriend, shows up at the apartment. She gets upset when she thinks that Ricki and Larry are now a thing, she slits her wrists, is taken to the hospital, and never appears again.
Harsher in Hindsight: Re-written to cash in on the "Bennifer" craze, Ben Affleck and Jennifer Lopez would end their relationship not so long after this film's release, leading many to speculate if their experience in this movie played a hand in that.
Idiot Plot: To the point that Pacino's character's whole role in the story is basically to point out to Louis, Larry, and Ricki how stupid they've all been.
Narm: Ricki laying seductively on Larry's bed and whispering, "It's turkey time. Gobble-gobble." Not only does it completely fail to be romantic or arousing in any way, but it's such a strange and nonsensical line that it crops up on many a list of the worst movie quotes ever.
Never Live It Down: The film made no secret of its painful attempts to cash in on the Bennifer craze dominating the tabloids at the time of its release, even being explicitly rewritten against the director's wishes for this purpose. The end result was received about as well as one can imagine.
Romantic Plot Tumor: In the eyes of many people, the film would have been a lot more bearable as a straight-up mobster movie instead of a cheesy Ben & J.Lo romance.
Snark Bait: This film is an easy go-to whenever anyone needs a joke about bad movies.
So Bad, It's Good: The premium movie channel that got stuck with the broadcasting rights tried to bill it as this. Their ad campaign literally included the phrase, "See what's so bad about what people called the worst movie ever!"
Squick: Louis getting his head blown off into a fish tank and the fish eating pieces of his brains.