Banjo and Kazooie
Invisible Start Pad
In Treasure Trove Cove, go underneath the dock where the blue Jinjo is. Press C-Up to get into the 1st person view and look up at the start pad. If you look closely, you will notice that the start pad isn't there.
Resetting Timer
In Bubblegloop Swamp. Hit the switch that activates the Jiggy along with the 45-sec clock. Stand above the switch and begin to Beak Bust it just as the timer reaches one. Normally, when the timer runs out, the Jiggy disappears, but with this trick, if timed correctly, the timer will simply reset and the Jiggy won't disappear.
Two Honeycomb Pieces For The Price Of One
As a crocodile, if you defeat a Buzzbomb (the big dragonflies), you'll get two honeycomb pieces instead of one.