Other mistake: When Johnny reads in the folded newspaper, 'There's a sale at Penny's!', the viewer can read the headlines right way up - which means, from his side, he is holding the paper upside down.
Suggested correction: It's a reasonable bet that this was done deliberately as a sight gag. Throughout the movie, Johnny is portrayed as being somewhat 'special'.
Continuity mistake: After the landing, Striker has big sweat stains under his arms and over his chest - but when he leaves the cockpit, his back is completely dry. (01:17:31 - 01:17:59)
Continuity mistake: Ted and Elaine embrace at the very end as the camera moves around them. You can see the wheels on the plane. Seconds later as Otto takes off with it, the plane has no wheels.
Audio problem: In the first scene where Ted and Elaine meet in the airport you can see that they have dubbed their voices in the edit.
Revealing mistake: When the doctor is removing the eggs from the woman's mouth, he actually has them in his hand, not taking them out of her mouth. A simple sleight of hand, but still noticeable.
