How is “not forgetting” used?

In The Gift (2015), one line is: “Well, you're not forgetting that this guy's not exactly stable?”

Which movie is “not forgetting” from?

The clip at the top of this page is from The Gift (2015).

Modismo

used to include sth in the list of things that you have just mentioned

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not forgetting…
used to include sth in the list of things that you have just mentioned
I share the house with Jim, Ian and Sam, not forgetting Spike, the dog.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Well, you're not forgetting that this guy's not exactly stable?

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