7th May 2020
Revealing mistake: When Mandy is hanging loose by the car's edge and Nick is grabbing her, there's a shot with a bluescreened background where Nick says "but you gotta help" where Mandy and the car are all blurry and faded and the image is doubled. Something went really wrong in that special effects shot.
7th May 2020
Revealing mistake: After Adam passes the car by the palm tree, when he slides it and makes sparks, Nick's hands are not real but from an obvious miniature.
7th May 2020
Continuity mistake: In Las Vegas Adam slides the car and sparks come out. His brother is either holding the wheel or waving his arms, depending on the shot.
7th May 2020
Continuity mistake: When Wayne is on top of the giant bunny holding the bullhorn he is in front of the bunny's hair in the close-ups, but hidden behind it in the angles where the baby holds the toy (though the bullhorn is still visible), obviously to hide the miniature-Wayne trick.
7th May 2020
Revealing mistake: After the giant baby grabs the giant bunny he then grabs his dad's head and the baby is replaced by an obvious inflatable doll.
7th May 2020
Continuity mistake: The chocolate stain on the baby's face when home behind the net changes from dark to light between shots.
7th May 2020
Continuity mistake: Before Allen jumps to chase the mermaid, the helicopter is above him and he looks up. His hair doesn't move despite the rotors above. Then in the following shots it finally does move.
7th May 2020
Continuity mistake: When the army exits the lab to find the mermaid the pavement is wet and the sky is cloudy. The following aerial shot shows the pavement dry and the light sunny. The light keeps changing with no continuity throughout the scene: cloudy, sunny, dawn, dusk.
6th May 2020
Continuity mistake: When Nick's mom tells him to show Gypsy around she takes the cigarette away from her lips. A shot later it's back in.
6th May 2020
Other mistake: When Kenny Rogers sings and Richard's mom claps, everybody is looking at the left except for a man with a hat who can't help staring at the camera all the time.
6th May 2020
Revealing mistake: When the cockroaches dance on the cake they cast no shadow and seem as if they're floating.
6th May 2020
Continuity mistake: Wen Bustopher is inside the trash he reaches for the top of the bottle twice.
Factual error: The billboards behind the kissing sailor and nurse photograph don't match the ones from the real photo.
1st May 2020
Audio problem: In Las Vegas, before the yellow car scene Nick says "we have to jump", but his mouth isn't moving.
30th Apr 2020
Continuity mistake: Adam picks up the yellow car sideways but the shot inside shows Nick and Mandy upside down.
30th Apr 2020
Continuity mistake: When Eric is about to wake up from his coma his jacket swaps from very open to slightly open between shots.
29th Apr 2020
Revealing mistake: After the vacuum cleaner scene, Eric tilts the Coke can completely to give some to Mac but no liquid falls out, revealing it's empty.
29th Apr 2020
Continuity mistake: When Eric wakes up and follows the remote controlled car his hair is messy but in a close-up it's perfectly brushed.
29th Apr 2020
Visible crew/equipment: During the first credits, when the name Kevin Bacon appears on-screen there's a close-up shot of a bayonet. A white screen used for lighting and filming is perfectly visible reflected on the metal.
29th Apr 2020
Question: Much is said about the infamous first released version with Judy Dench's real hand instead of a CGI paw, but I'm watching that same version now and ALL of the cats have real human hands. How is this not also a mistake? Or is it that the mistake is Dench's ring on her finger? Do the actors' human hands change to paws in the CGI-fixed second version?
Answer: The issue wasn't about her hand looking human but, as you mentioned, that she was wearing her own ring, which was digitally removed in the revised version.
raywest ★