Officiating at the End of Game

Do teams not have to signal for timeout?
In both of the last two plays, refs reset clock to where player is down - no one signals for TO

Also noticed in 1st half refs added a magic 2 seconds- player was down at :13 but :15 is when next play started
(Very glad Atl just let clock run down from :12 with one TO in their pocket)
The ref said (I think) that Atlanta called a timeout. I seem to remember reading somewhere here that one of the replays showed the coach calling a timeout.