Mistakes in Serenity

Mistake #1

When the cast are at the Miranda colony and discover that everyone is dead, there is a rotating shot of River as she realises what happened. Prior to this there is a brief closeup shot of the rest of the cast as they turn to face her. Jayne turns to his right, but in the following rotating shot of River he has turned from his left.

Mistake #2

On Miranda there is a shuttle crashed into the side of a building, but there are no burn marks or a trail from where it hand crash landed. The shuttle couldn't possibly have crashed into the building horizontally without crashing diagonally/vertically first, landing horizontally and then sliding into the building. Joss Whedon even states in the director's commentary that some burn marks would have been nice but it only occurred to him about 14 months after it was filmed.

Mistake #3

When River goes crazy, knocks out Jayne and Simon and then holds Mal at gunpoint, you can tell that the gun she is holding is quite heavy because her arm wobbles. But when she cocks the gun it is completely still. In the cast commentary of the DVD, Joss Whedon reveals that the gun was in fact held up by a C-stand for that particular shot because the gun was too heavy for Summer Glau to hold. (Note: This is not the scene with River's choreographed fight in the bar on Miranda. I'm talking about when River goes crazy on Serenity. Check the timecode before thinking of correcting this entry.)

Mistake #4

During River's first fight scene she climbs some stairs. She then does two forward flips down the stairs. As she lands, her hair is raised from doing the flips but in the immediate shot her hair is down again.

Mistake #5

During the last fight with the Reavers, Inara is holding a blaster gun shaped like a bow and arrow in close up shots. In any shot that shows the whole crew, the blaster changes into an actual bow and arrow. The producers didn't like the bow so they actually enhanced it with CGI to make it bigger and "cooler", so those shots of the whole crew are probably shots where they forgot to add the CGI or assumed people wouldnt notice.