When Kelso returns to apologize to Jackie, the teddy bear is lying on the floor when he opens the door. When he takes a step toward the bed, the bear is gone. A moment later, it is back on the floor behind his feet.
When making sandwiches, they are using Best Foods mayonnaise. This brand is not available east of the Rockies. In Wisconsin, it would be Hellmann's, as that is the equivalent brand.
At the start of the episode, a disclaimer states that it's mid-summer. Later, Hyde mentions his mother left because it was springtime and "love is in the air".