He purchased a ticket and went in dressed as a normal movie patron. Then he went out the fire escape door (near the front of the theatre and to the side of the screen), and either had the stuff stashed close, or in his car, and suited up.
An UNIDENTIFIED THEATRE EMPLOYEE opened the FIRE ESCAPE DOOR (which is impossible to open from the outside), and let him back in.
That 'employee' has not been identified. (Clue: He wasn't even an employee. He was part of the 'team' of handlers)
Do you know where you've seen this? It is exactlythis type of information that will be scrubbed during the next few days.