Modric, exaggerated his contact, it didn't take him down but could well have thrown him off, it was definite contact, had he just stumbled a bit the ref still should have given it.
The ref though, horrific, laughable performance, what was it in the space of like 10 seconds, a tug from Shawcross on Defoe which frankly was a red and penalty, seconds later he saved it with his elbow, another penalty, maybe a red, might have been going wide and should have hit the guy behind him anyway and probably not gone in. Then ruling out a clear as day onside goal, laughable really.
Spurs got screwed because at that point one way or another it should have been 2-2 at that point with Spurs by far the better team at that point.
Overall Bale and VDV were completely useless and one of them should have been replaced a LOT earlier. Bale just refused to pass, lost the ball or delivered an awful cross for 99% of what he did.