Well, for as I could rent 3 vids for the price of 2 in the video rental shop, I often took two "normal" vids like action, thirller, comedy to make a video-evening with some friends, and one porn for the aftershow :D , so I know many of those "excuse me"vids, and I used to have the whole vid as a copy on VHS. she's "raver girl"-style and I think I remember her to be german. Looks like if "Horny Harry" has just catched her up from the love parade ;)
This here is the volume with the girl you are searchung for: http://www.seventeenshop.com/product.php?productid=970&cat=0&page=3
Usually those "excuse me"-girls don't appear in other vids. Well, this was the case in the earlier parts, I think THAT volume was about from 1995-1997. In later episodes Herry uses more "professional" models, who appear in other videeorama/seventeen-vids (thats the label) too, and now Harry uses the name "excuse me" to mix other series into his DVDs and name it "excuse me special" or something like that, but it's only a kinda "best of seventeen".
However, all the girls seem to me not to be accidentally catched up from the street, but they act as if they were. Maybe he first askes or castes them, and then they pretend not to know Harry. Some girls look as if they take a lots of hard drugs and just do that vid to get some money... First he talks a LOT, it's a kind a game "you're so pretty, I just wannt so see something, would you show me some more...?" - in many vids the girls get dressed and leave the room, when Harry gets too intrusively (he says about every 2 minutes "I dont want to offend you, but... :D ), like when he gets a Dildo out of a bag. But there is no sex shown in those vis, except fingering and masturbation. Just in very very few cases he fucks a girl or gets a BJ, but you cant see details, and the cam mostly is turned off, so it could be fake.