Continuity mistake: When talking in the pub, Sarah's hands are around her wine glass or not, depending on the shot.
Continuity mistake: When Mark and Matt go into the changing rooms, after the workout, Matt is getting ready to shower. While Matt is talking to Mark, Mark puts a jumper on, but when he reaches into his locker to get his bag out, he is no longer wearing his jumper, until he puts his bag on his back.
Nether Zone - S7-E4
Other mistake: Jeremy and Mark are locked in an apartment building. Mark calls a locksmith but is unable to get any assistance as he doesn't know the address. Several minutes later Jeremy orders a pizza to the address and it arrives with no issue. (00:04:28 - 00:10:20)
Suggested correction: Mark gives a series of addresses with the help of Jeremy who finally seems to remember the address. Although, there's no indication the locksmith wasn't willing to help. After the call Mark said they called him a "prong." And if they didn't offer any assistance, it could be because they thought it was a prank. When Jeremy calls the pizza place, part of his conversation is drowned out by Mark's voice over, but is reasonable to assume he gave the correct address now that he remember it.
