"'Home Alone' was a movie, not an alibi"

In this quote, Jerry Orbach is making a smart play on words to highlight the distinction in between a movie and an alibi. He is describing the popular film "Home Alone" and using it as an example to reveal that even if something might look like a legitimate excuse or explanation, it does not necessarily imply it is true. Orbach is implying that an alibi, which is a claim of being elsewhere at the time of a criminal offense, can not be corresponded to a film, which is just a form of home entertainment. This quote works as a reminder to not always think what we see or hear, and to carefully examine the truths before jumping to conclusions.