Revealing mistake: When Alex sets-off the smoke bomb in the warehouse, the smoke is coming up from under the grate in the floor nowhere near the DS.
Revealing mistake: When Alex is escaping on the quad bike, he skids to a stop to wait for the helicopter. There are numerous skid marks visible on the ground in the same place where previous takes were shot.
Revealing mistake: After Alex has been pulled through the wall of the photo booth and is sitting on the chair waiting to move through the tunnels to MI6 headquarters, the wire used to pull the chair's platform along is plainly visible.