The first dart Bob throws at Helen's picture lands right in the middle of her head, blocking her face. Yet when the scene is cut and he walks away from the dart board, her face is now exposed, dart removed, ready for the camera to zoom in on her picture.
After returning to her apartment after falling into the ocean, Helen's hair and makeup are the same, as perfect as they were when she left the apartment to meet Bob.
During the car chase, Sylvia goes from being in the back seat of the cab to sitting in the front passenger's seat without the film showing how she got there.
When everyone arrives at the airport, the green taxi pulls in behind Frank's convertible, which pulls up to the front of the yellow taxi. Moments later, the taxi driver arrives on the motorcycle. He hits the back of the taxi and flies over it, but the other cars are not there.
American Airlines has never served Fiji.
None of the cabs have meters in them.
When Frank is released from jail, a black, 1959 Cadallic convertible passes him on the street as he is hailing a cab. Sylvia comes out of the police station seconds later, and as she stands on the same mark Frank was standing on, the same black, '59 Cadallic convertible passes her.
When Helen and Bob fall into the ocean, it is clearly an inside water tank with the water dyed blue, not ocean water.
Immediately after Rudy asks Gretchen if she likes to dance, the shot changes to Frank's car going the wrong way up an on ramp, narrowly passing between a light blue Corvair and a black car. Then, as Frank reaches the top of the ramp, he again narrowly misses a collision with another light blue Corvair.
While on the chase to the airport, it can be seen that the road they are driving is normally a two-lane road being used as a four-lane highway. The double yellow line can be seen in the center that divides the normally opposite flowing traffic.
When Gretchen is singing the Anniversary Song, as she dances, her voice occasionally is out of sync with her lips.
When Gretchen is singing her anniversary song, at the end, she and Bob hear something in the kitchen and look there. She stops singing and closes her mouth, but one can still hear her voice slowly fade out after she has closed her mouth.
During the last few frames of the shot when Bob is upside down in the water, Helen laughs out loud.