• Non-defining relative clauses are separated from the rest of the sentence by commas.
✓ Megamonsters, which was filmed in New York, is a very disappointing film.
• We cannot leave out the word which introduces the relative clause and we cannot use the word that instead.
✘ Megamonsters, was filmed in NewYork, is a very disappointing film.
✘ Megamonsters, that was filmed in NewYork, is a very disappointing film.
• Which can refer back to the whole of the sentence.
✓ We finally got tickets for the concert, which was very lucky.
(It doesn't mean the concert was lucky. It means getting tickets for the concert was lucky.)
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