Things that make no sense

I get it, comedy, really funny, maybe the best comedy movie ever made.

HOWEVER..

If she knows 'a little German', then why doesn't that man help her? She knows him before meeting Nick, so why does she need NICK to help her get in the restaurant? This makes no sense. Why can't she just say 'my friend, a little German, is sitting right there, I am with him', or something? Why doesn't he offer to help, surely he must see her struggle in the entrance.

This makes no sense.

The parachute scene - of course it's funny, but it kinda takes me out of the story when things make no sense. The parachutes would get SO entangled, and they would both fall like rocks if they went so close to each other and even HUGGED in the air.

Also, aren't those parachutes opened way too soon, when they're supposed to be opened as close to the ground as possible while still high enough that you don't die? They spend ages and ages 'making love in the air' and having these dramatic conversations. I am not even going to mention the fireplace-thing, at least it's a consistent gag.

I mean, try to imagine how the parachutes would behave above what we're seeing, with every action they take - what are the chances they wouldn't get massively entangled into a mess that couldn't keep you alive when falling?

This makes no sense.

The professor digging a tunnel is funny and all, but why would he put those traffic signs in there that say something like 'New Jersey' if I remember correctly? Where did he even get those, why would he bother with them?

This makes no sense.

Just for clarification, I have laughed myself into a multi-dimensional unified entity and back, this movie is stupidly funny. But some things just do not make sense.