as he mentioned

[color=blue]1) She did not, as John mentioned, kick the door open.
[color=brown]2) She did not kick the door open as John mentioned.
[color=indigo]3) She did not kick the door open, as John mentioned.

Are the sentences all correct?

In which case:
a) the speaker is confirming what John said
and in which case:
b) the speaker is contradicting John

Does ‘2’ mean ‘she did not kick the door open in the manner John said’?

Gratefully,
Navi.

3 - confirmation
The others could be either.