Plot hole: Lucy has been painting pictures of Henry since she moved into the institute. But she passes him at the zoo and doesn't recognize him.

50 First Dates (2004)
1 plot hole
Directed by: Peter Segal
Starring: Adam Sandler, Drew Barrymore, Sean Astin, Rob Schneider
Continuity mistake: The dark roots of Lucy's hair can be seen off and on throughout the movie. One day she will have dark roots, and the next day she won't.
Henry: Ula! Get back to cleaning the pool! And if that's one of your special brownies, don't let any of the dolphins eat that.
Ula: How do you think I get the dolphins to do double-flips and play with the white kids?
Question: When Henry and Lucy are getting intimate and Henry sees the two dolphins in the tank watching, he calls them Mary Kate and Ashley. I know who they are but why does he refer to them like this?
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Answer: Probably because it was the dolphins' names. Someone probably thought the dolphins looked alike and that it would be funny if they were named after the famous twins.
Andreas[DK]