Retroactive Continuity

''Ted: Dude, how are we gonna get out of this? We don't got any time!''

''Bill: Yeah we do, dude. Look, after we get away from this guy, we use the booth, we time travel''

back to before the concert, and set up the things we need to get him now.

Ted: Whoa, like what?

Bill: Like, uh, like a sandbag!