Other mistake: When Superman and Lois are flying through the clouds, there are a number of shots in which we see Superman from Lois' point of view. If you look closely, you can see that Christopher Reeve is not being suspended in these shots, but is, in fact, kneeling to look as though he is flying. You can tell by the profile of the red trunks.
Other mistake: When the gang are at The Palimino Club, there are certain long shots you can see that there is no roof to the room and it's a 3 sided set.
Other mistake: When the bad guys are taking the cash from the vault, they finish with just 3 duffel bags. Yet there are blocks of cash along all the walls, roughly 25 times as big as what they're taking. With the duffel bags supposedly containing $100 million, there would be tens of billions of dollars for the taking. Their escape route is up the elevator to the roof, and into a helicopter. What bad guys wouldn't take all they could carry?
Other mistake: When the shark grabs and eats Marge, there is no blood at all.
Other mistake: Fred MacMurray is listed as "Clarence" in the closing credits, but when he is standing outside his store and talking to Maureen, a promotional sign in the background spells his name as "Clarance."
Other mistake: The opening credits list Tomas Milian, Bo Svenson, Gille Kirsten, etc. Everyone (before and after) by FirstName LastName as customary, except Kirsten Gille.