I think that both calls were wrong and I always root against Dallas (unless they are playing Denver or SF, that's when I hope they both lose!)
The call with Cobb from GB was really quite obvious from the back view, but not easy to tell from the front. Replay officials shouldn't have got that call wrong, although I only suspect conspiracy when Peyton Manning is playing.
The call with Dez Bryant is probably correct within the 2014 set of rules, but if so, I have to say then that it's a TERRIBLE rule!
I also strongly disagree with defensive holding when a defender grabs a jersey for a nanosecond on a play a dozen yards from the real play. This is absurd.
There must be a better way to determine whether a defending player interferes or truly impedes an actual offensive play from completing.
The plays are all subjective anyway, so just allow the athletes to compete!
True interference should be called. Not the crap I see get called on every Manning incompletion. The new rules have to go. If "sissifying" is a word, that's what they are doing

They apparently are trying to make it safer for the players. I see no evidence that injuries are less with the new rules, but I do know that the games are seemingly *all* being strongly influenced by questionable calls. Calls that would not have been considered years ago!
It's really not that hard to tell when a guy catches a ball (Bryant did) or when someone interferes on a pass play (see the "picked up flag") they have been doing it since the implementation of the forward pass. This is the worst interpretation they have ever used.