Bad calls are made all the time in ever single sport from little kids up to the pros. It's a fact of life, sometimes it hurts your team, sometimes it helps your team. Deal with it.
Other than Cruz getting away with it, and Calvin not, I really don't see where the huge issue is. Neither one of those would have been catches out in the open field and it should be no different in the end zone.
If Cruz's catch had been ruled incomplete and Calvin's a touch down would anyone, Lions fans that is, be complaining about inept officiating, unfair reviews, or poor rules?
I know I'm nothing but a band wagon Colts fan...
But I've always tried to look at everything in professional sports objectively.