Here's one for you guys which should have been called back.
Got sent this clip this morning. This should either be an illegal formation - 5 in backfield. LOS officials can put WRs on or off to make sure it's a legal formation, but in this case there is no way of doing that. The inside WR is clearly on, outside WR and inside WR are clearly off (both on same yard line). As an official, you cannot put one of those on for legal formation and keep other off.
I referenced in another post on Harbaugh lighting up 5 officials before a kickoff, this is the play prior, now I see why he was livid and rightfully so.