When Solo sends the box with the grenade down the conveyor belt the time on the wall clock is at 11:48; when Rudolf undoes the lock on the door the time on the wall clock is back to 11:45.
On return flight the Boeing 707 is headed in the opposite direction as earlier portrayed. The image was simply flopped and the 707 on the tail is a mirror image.
Ilya opens a hole into a room from which the air had been pumped but there is no visible indication of the air that would have rushed into the room through the hole.
When Solo and Rudolph were just entering the vault at about 30 minutes in a wall clock could be seen showing 11:45, but the second hand was not moving. This suggests the clock was left stopped to do a number of retakes.