Revealing mistake: When Dori types in an inquiry into the computer it is very obvious that her typing is absolutely nonsense - she types the same three letters in a row over and over again, and never presses Enter. (00:19:05)
Brother, Can You Spare a Crime? - S1-E17
Revealing mistake: When Dori jumps over the table to save the vase you can see that there is a stunt woman making this jump. Futhermore the table is too short to stop her - but the rest is cut away. (00:22:25)