Uncle Martin takes Brennan's hidden engagement ring from Tim's hand and levitates it into the non-flapped breast pocket of Mrs. Brown's brother's gray suit. In a subsequent shot the ring has reappeared in Tim's hand. Additionally, Brennan eventually finds his missing ring in the flapped side pocket of his black tuxedo, rather than in the breast pocket of Mrs. Brown's brother's gray suit.
When LoreleiMartin is talking about the earrings to Tim, she describes them as 'Corundum, high carbon content'. Diamonds are not made of Corundum (which is AlO, Aluminium Oxide), but (mostly) pure Carbon.
When Martin changes the molecular structure of the mouse, the clear panel between the mouse and the cat is no longer there as the mouse moves past where the panel was..