These seem to mean exactly the same thing. They surely sound different though, so maybe I'm missing some subtlety. Do the sentences have a different meaning?
It seems like a random occurrence.
vs
It seems a random occurrence.
I'm also curious about this one:
It seems to be a random occurrence.
Best Answer
All the sentences you wrote can be used, and would mean to give the impression or sensation of being something or having a particular quality.
Looking on the Corpus of Contemporary English for some phrases containing it seems, I get the following result: