Ticking sound after timing belt

[SlowWhite]

Lifters are what it sounds like. But what has me thrown off is why did it appear after the timing belt?

I didn't do the timing belt job myself and I never have done one. So I'm not sure what I should be looking for.
Guessing here:
-missing bolt
-loose cover
-gasket leak
-bolt rubbing

I want to fix it but not sure what I'm even looking for. The guy who did the timing belt I shares the video and he said check the intake bolts.
I didn't check the intake gasket but all the bolts were tight. (Not really sure how am intake would have anything to do with a timing belt job...Ie why would something haopen with the intake during a timing belt job?)