@Isaac,
He got called for the two hands check early in the drive. The second call effectively happened as a dead-ball situation, thus the head contact in the block attempt, even if accidental, was considered to be excessive contact. There simply wasn't any need for it, the first foul was on the floor, he had to change direction and then go up for the layup, there was never, ever going to be continuation. I know he said he had to contest the shot, but to me it just seemed like a crude intimidation attempt that backfired.
The ref can't just ignore the first foul he called and he can't just ignore the foul in the block attempt. Conklin can talk about this history or that history, but the fact remains that he shackled the ref's hands on that call. Doesn't matter what the game situation is, you can't simply chuck the rulebook, so the ref simply had to provide the effect to Conklin's cause.