Honestly, the "hook" in picture 2 is not what it looks like when you view it in real-time. The Giants lineman wasn't grabbing or hooking; he had his hand on that part of the shoulder for about 1-2 seconds, and took it off. It didn't even affect the defender's motion or movement at all.
In picture 4, the lineman is getting pushed into the defender; he's not grabbing.
The rest are pretty incidental; the refs will never call something in the last 5 minutes of a SB unless it's egregious, obvious & clearly affects the play's outcome (and even then, they often swallow their whistles)....
