I'm still gnawing at all these 'continuality flaws'. I swear Mike has used gel in his hair before (last year's prom?? performances?? competition??) Or other hair care products (hair wax, putty, glue and/or maybe even hairspray) because I am sure a guy like him would have some conscious effort about his hair as he does his fashion sense. Maybe not on an "expert" level as Blaine would which is why he's looking for that advice.
That makes sense. I would assume a free period or "study hall" would have them going to the choir room (or weight room) to hang out, rehearse and such. Seems like things are more "non-traditional" at McKinley than "traditional". Whatever. We only got so many weeks before we go AU and such.