Tomlin and the Challenge Flag
Who gives him input as to what to challenge? I assume he has someone up in the booth that has access to replay, etc. IMO his camp has done a horrible job at challenging plays this year.
I understand that sometimes you want to challenge a questionable play even though it is unlikely that it will be overturned. This is usually a situation that you want to break up/disrupt the rhythm of the other team(particularly offense) and/or you can use it as a timeout anyway.
I also understand he is green and will get better with these types of decisions as he matures as a head coach. Still, the point stands that whomever is responsible for guiding him in these decisions is doing a pretty bad job.