Continuity mistake: When Raymond tells MacPherson about Artie being released, the shot changes, and the screen changes from showing a tally of ~540 artifacts to ~340, and the images of the scrolling artifacts change as well.
Continuity mistake: When Pete picks the items up off the floor, he picks up two red skeins of yarn and the brush that sets up the whole episode. However, when he stands up and puts the items on the shelf, he now has only one red skein of yarn and one blue skein.