At the end of Incredibles 2, Elastigirl was surprised by Jack-Jack's powers. Mr. Incredible said she missed his first 17 powers. However, we the audience saw these powers. He was asleep when most of the powers were displayed.
I know Edna demonstrated some of them when Mr. Incredible went to pick up Jack-Jack but there were ones he didn't see because Edna didn't demo or he was asleep, like:
- the super strength (kicking the raccoon really far)
- turning into putty when the raccoon tried to attack him.
So, like my title says, how did Mr. Incredible know of all 17 powers?