If by odd stuff you're talking hardware, on big one is the halyard lock, not commonly seen on mono's, the halyard locks into a fork or hook on the mast (depending on brand) to remove some of the compession force on the mast, and usually the jib halyard has a block that goes up the mast when the sailis down, when hoisted it gets hooked up with one on the mast to give a 3 to 1 purchase for getting good luff tension. Then there is the locking pin for the mast base, it keeps the base on the ball during stepping the mast, but needs to be removed for sailing or the mast won't rotate.