MRS. DOUBTFIRE - Lime disappears and reappears

The Lime that Mrs. Doubtfire throws at Stuart dissappears and reappears in a few shots. You see her take it and throw it at him. Then when Stuart turns around and she says "Oh, Sir" you can see it back in place. You even see it again as Mrs. Doubtfire is walking back to sit down. But then in the close up when she is sitting down right next to it and says "Loser" its gone.