haha..no worries. I don't know, I don't have any hard evidence to back it up but I feel that anecdotally I constantly see teams fail to perform at their optimum level prior to a big match up the following week, especially when they're playing what is perceived to be a weaker team the week prior - hence the term "trap game" which has been around for quite a while.
I understand that players prepare and practice for every week, but at the end of the day they're human and not robots. When I played sports in high school and somewhat throughout college, I always knew when our big game was coming up and sometimes that 2% of your body/brain that wasn't 100% focused on this week's matchup was the difference between a victory and a loss - especially in the NFL where the talent is essentially even across the board for the most part.
I don't think coaches ever look past an opponent but I really feel sometimes players do.