Codes
BDCT-AA8N + BDDT-AA5W - Infinite lives in buckboard chase
FW5T-ECGY - Shooting Gallery timer runs at 1/10 normal speed
L1AT-FLAY - Small ducks worth 155,550
EMBA-FEF6 - Flying ducks worth 122,200
ATGA-JA4A - Infinite hits allowed in pie throwing level

Level Skip
Get back to the future with this trick. When you want to skip a level, pause the game, hold A and press Up, Down, Left, Right to advance a level.