[Jamesy]

Originally Posted by hannah.

Considered searching for 'fake money in lemon trick', decided against it. Go on?

Watch Jamie do it again and you can easily see how he does it.

Youtube video

When he puts his hand in the red bag he's putting the note in the lemon (from a slit he cut before the performance). Then when he takes said lemon out you can see he covers half the lemon, where he already made a cut to insert the note.