LOL sludge you make a good point but i was also getting hella pimples too during my junk food spree...and im also really not sure if the beer/potato chip calories actually added anything as far as strength was concerned, i think extra oatmeal calories would have done me better...no?
If your micronutrients weren't getting filled out, probably since oatmeal's got some fiber and it's a slow-released carbohydrate. However, in moderation and with your micros being met, neither beer nor potato chips would have negatively affected your gains while on a bulk. I know what you mean about the pimples/sometimes "icky" feeling one gets from eating junk. I'm actually cutting out Clif bars because of this and they're not even that "junky" - they just taste way too sweet for me these days and remind me way too much of a candy bar.
I'd be interested in checking out those studies you were talking about - I haven't ever really come across anything like that, though, it's true that "junkier" food tends to have one hold a lot of water weight but, as far as I know, the only thing that really makes you put on fat is a caloric surplus?
On a semi-different note: I, personally, have about 4-6 beers or 8-10 drinks a week, though, usually spread out over two different non-training days and follow Martin Berkhan's alcohol "rules" to make sure I get my micronutrients in, stay in my calories, and don't do too much "damage." It's not for everyone and I'm not competing but after the comp, you should look into what he has to say about it because it's really solid advice.
In fact, after you're done with the comp, I'd look into, if not following IF and IIFYM, using them loosely to fit things like Chipotle into your diet, if not every day maybe like once a week or however often your macros allow it.