Seemed like a good idea...

SPOILERS: The Girl Who Waited has started becoming suspiciously knowledgeable

In the room with the doors as the three of them were escaping to the TARDIS…

Rory: Can’t they just teleport in?
Older Amy: It’s not a teleport. It’s a time jump.
Younger Amy: They can’t jump within the same time stream.

Older Amy looks at her quizzically. Younger Amy looks satisfied but a bit confused as to why she knew that.

At first, I thought it was suspicious that older Amy learned so much and even built her own sonic probe. Then, I just assumed it was because she had all that time and the Interface.

What if that wasn’t it? I mean, she did hack the Interface before it would give her all that information. Where did that knowledge come from? It seems to be evident that the knowledge is coming from an external source without Amy (younger one, this time) having to seek it out. She just knew and followed quite closely with older Amy’s reasoning.

It could be nothing.

It could be Moffat shenanigans at work.