Amy laughs at him when he says all he's really gotta do is pass for an ordinary human being: "Have you seen you?" She starts in on the bowtie immediately, but you know that shit's not going to fly. I have the weirdest feeling that if she were being this aggressive and they were in the same room, I would find it insufferable, but something about the TARDIS going bonkers with her inside, all alone, makes her hardness sort of loveable. I mean, I guess it's the same rules as the Doctor's unrelenting oddball hysteria throughout this entire episode livable: It makes sense. And they're both so cute and it's so often hard to remember than when they're slogging through the more challenging episodes.
"Bow ties are cool. Come on, Amy, I'm a normal bloke! Tell me what normal blokes do." Telly, football, go down the pub. "I could do those things! I don't, but I could!" There are some matrixy hiccup moments and tiny time loops, but they don't really matter that much. Although given the nature of the thing upstairs, that seems like a clue as well. He tells her to keep an eye on "the zigzag plotter," but to pull it only when standing in a certain way, it's very esoteric and sort of lovely, as far as Amy learning to be a pilot. He steals out by night, bringing home garbage.
The Doctor's taking a shower. No big deal.
He's in there for a way long time, though, without really caring that Craig's outside, but then a mysterious bashing booming sound alerts Craig to the upstairs boarder, and he goes to check and make sure the old guy's okay. Soaking wet, the Doctor realizes that Craig is heading up there, and goes slipping and sliding around on the bathroom floor for awhile, and it's fairly excellent. Then he grabs what he thinks is his sonic, but is actually Craig's toothbrush, and runs out in a towel, hair all a mess. But no prob, because the thing upstairs doesn't want Craig, so really it's just the Doctor running around basically naked, which is totally fine at any time.
The Doctor explains, with zero shame, that he was there to save Craig from trouble. "Well? If I ever am, you can come and save me. With my toothbrush." He could, and he would. Welcome home. Sophie shows up and the Doctor waddles over in his towel and gives her a double-cheek kiss hello, and they go inside. Craig's got some kind of football problem, didn't really follow, but anyway could the Doctor substitute on Craig's team? The Doctor sees no problem with that. I hate to say it but at the very least pants are going to be required here. There's a moment where Craig and Sophie sort of awkwardly discuss her role in his life and this football league, it dies down fairly quickly and the Doctor goes to change into his uniform. That is going to be acceptable.