Continuity: When Spooner first finds Sonny in USR, he pulls out a large gun from his shoulder holster, which later gets knocked out of his hands, causing him to grab his smaller, back-up weapon from his ankle holster. After chasing Sonny out of USR, Spooner holsters the smaller gun in his shoulder holster and it fits perfectly, and then picks up the larger weapon off the ground. Additionally, after Spooner and Dr Calvin arrive at the factory in search of the renegade robot, He reaches into his side holster and pulls out his original larger weapon - even though at no time do we see him transfer his backup gun back to his ankle holster.
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