M.C.
My first thought on reading this, for both the bathroom incident and the bus incident is that he was just being a 7y boy. Was it right? No, but I don't think it is necessarily related to the ADHD.
Did you ask him why he was laying on the floor of the bus? Besides not being safe, its not the cleanest place to take a nap!
My 9y has a hard time focusing on individual work and has missed SEVERAL recess periods over that last few years. That is not a bad thing. It is teaching them that the work comes before play. Last year it took me going into the school before school once a week. Having HIM sort through his desk and finish all the papers (that he'd been missing and just COULDN"T find!) with me standing there. He would finish them in under 10m, but when left on his own would take days!
As for him not telling you the truth, there are easy ways to prompt him. For my son, I just say something like 'So I got an email from Ms. J today'. Do you know what that's about? Once I was just kidding and he responded with 'Man, she's fast'. .... that opened a WHOLE can of worms! We also have a website where you can see what they ordered for lunch. That one throws him every time!!
For the bus incident, I applaud you for the apology note. Our driver used to take it one further and had a kid write the note and then read it out loud to the bus.... You could also get a copy of the bus rules and have him write them 5 times.
I would also probably back off a bit until the 3rd or 4th episode. He's a boy. He's going to be curious and get into trouble. That's what kids do. That's how we learn. That's how we make memories! He'll test the boundaries and the teachers will correct him.
As for the football game tonight, if you were really wanting to go, I don't see why you shouldn't. Just skip the popcorn and ice cream...
Good luck
M.