Continuity mistake: When Frank and Martha are walking by the river, he is carrying her orange bag. At first he is carrying it hanging by a strap from his shoulder, but when the angle changes he is carrying it by a handle.
Continuity mistake: When Downtown strikes out on TV, he is wearing #14. When he is in the dugout getting hassled by Carlos Liston, he is wearing #16. (01:07:30)
Continuity mistake: Earlier in the film Steven Seagal explains that in his lab they used plastic beakers because glass can cut the monkey suits.Later in his lab they are using pyrex beakers and when they clink together, they are clearly made of glass.
Continuity mistake: Annie Girardot and Murray Head are playing with the cake dough and playfully hit and splatter each other. Between the various takes, Annie Girardot gets some cleaning done, because she had hair and coat all messy midway through, but is much cleaner when that part of the scene is a wrap and the story moves on; the hair (she had an egg cracked on her head) is fine and the coat that had streaks of cream on the lapel is almost spotless. (00:25:20)
Continuity mistake: Rosina is meeting for tea the fish trader that she is supposed to marry. Her mother hands her the plate with cake, she takes it in the first shot, but she is taking it again in the following. (00:10:15)
Continuity mistake: When the two cats move past the yawning rat to go up the crane lifter, the door is shut, but they slip into its semi-opened door when they reach the platform in the next shot. (00:06:05)