Hardy played the hit on the head with a brick, and then when he thought that was the worst, he'd get hit on the head with another brick.
This schtick has appeared (in various forms) in endless movies. It's so cliche I knew the goblin king was going to fall on the dwarves the moment one of them said "that wasn't so bad".
Then there's the good guy slicing the bad guy with a sword. You think he missed, then the bad guy looks surprised as his head slides off. I've seen that in probably at least 6 movies.
Falling into the abyss, and yet being grabbed and saved at the last second. Where have we seen that before? The literal "cliff hanger". And we get to see it several times over in The Hobbit.
I still liked The Hobbit. But in spite of those scenes.
Don't forget that The Hobbit is an adaptation of a childrens book. I think a bit of slapstick fits right in.