Revealing mistakes: When Sam is in Helpmann's office looking at the printer, pre-printed text can clearly be seen on the feeder roll.
Revealing mistakes: Just after Sam Lowry has 'hijacked' Jill's truck and is trying to make his escape, Jill has to drive through a couple of barriers. However, the barriers explode and break before the truck has actually reached them. One must also question why wooden barriers are exploding upon impact, in the first place.
Continuity: The "Trucking" magazine behind Jill's head during the truck chase is first folded, then open.
Continuity: Holly's hair has a big gap in her front bangs when she says her one line, whereas before her bangs were intact. Holly Gilliam did this on purpose in an effort to avoid working on the scene again because she despised the process of filming. It didn't work, and the result is the continuity error.
Continuity: In the dream sequence when Sam is battling the typewriter warrior, the warrior slams his spear into the ground, leaving over half the spear head exposed. However, a few shots later, when Sam retrieves the spear, the head is completely buried in the ground.
Continuity: When Harry Tuttle escapes from Sam Lowry's flat, the front door is shown open from the outside and the room is fully lit. However in the previous and subsequent shots, the flat is almost dark.
Errors made by characters (possibly deliberate errors by the filmmakers): When Sam Lowery first gets into Jill's cab, he says that he is number is D Zed stroke 105 (DZ/105) when in actuality his number is D Zed Stroke 015 (DZ/015)
Continuity: After the bombing in the mall (when Jill is holding the suspicious package), Sam Lowry gives his coat to a wounded woman and is apprehended shortly after. In the next scene in the back of the paddy-wagon, Sam is wearing the coat again.
Continuity: When the secretary transcribes the words of the tortured, the second time the text is shown, there's actually less text than in the first shot: already typed out lines are suddenly vanished.
Revealing mistakes: When Sam enters his apartment after the Central Services had frozen it, his shoulders bump into some "ice" that is hanging from pipes. You can clearly see that the "ice" is made out of rubber.
Continuity: When Sam falls over Jill's truck's hood, she walks around and sees his right foot hanging on top of the grille over the truck's fog/turn lights. But when the angle reverses to show her, his foot is resting on the bumper, in front of the grille.
Continuity: When Harry Tuttle escapes from Sam Lowry's flat, he is wearing a hood covering his head. When Harry starts to zip-line off the precipice, he is replaced by a stunt double wearing a baseball cap.