Revealing mistake: When the transvestite is throwing eggs at Samantha's window, she is holding the cardboard egg container in her left hand. She keeps throwing eggs, but you can tell by the way she is holding the egg container that it is really empty. It flops down vertically from her hand, and there is no way eggs would be able to remain in the egg crate by holding it in that manner.
Revealing mistake: When Samantha and her partner are using the 'swing,' you can tell from the long shot that Kim Cattrall is actually wearing some sort of prosthetic around her hips, to simulate her rear area. It is larger, and sticks out prominently in an unnatural manner. This was probably done to ensure modesty for the actress. (00:22:30)
Revealing mistake: When the gardener hands Charlotte the rose, he is supposedly picking it out of some rose bushes he is in the process of planting. He even makes a motion as if 'picking' it from the bunch. But when he hands the single long stem rose to Charlotte; it's obvious that this rose has already been cut, and is missing the lower leaves. (00:16:05)