We actually needed to stop the movie down for a few minutes and explain things to them.
Time Travel? Who's George Carlin? Why is Neo playing a dumb-ass [kids... what makes you think he's playing...]? What the hell ever happened to Alex Winters? Nope, those were all ok, no explanation required.
The real hang-up can be summed up in my daughter's first question:
"What's that box with the door that they're standing in?"
-- Talia, June 2010
Yeah, my two kids (ages 9 and 11) couldn't comprehend the concept of a PHONE BOOTH.
[ Oh yeah, go back and re-read 3 sentences ago and groan about my telegraphed pun. I am on fire!]
Not only are my kids too young to know what a phone booth is, they're so deep into the cell phone and internet age that they can't even comprehend life before ubiquitous connectivity.