ㄴ가 들다

carrying something; something inside

Every line here is 뭔가 "something" in front of a form of 들다. Two related senses show up. Carrying: he brought something, the boss coming over with something after filming, coming in with his hands full of something. And containing: there's something inside, right? a situation where something was in it. 들다 is a busy verb with several unrelated meanings, so the 뭔가 in front is doing most of the work here — it flags that the speaker isn't naming the object.

Register: casual spoken