You can cancel SJP by holding down zap button. Try not to collect SJP until you have several stacked and a playfield x, preferably 6x.
Shoot Herman to start a hurry-up. Shoot Herman again to collect it and magna-lock a ball. Shoot the captive ball again to start multiball.
This game by default has no ball saver. Always short plunge to a trap on the right flipper and ignore the low scoring skill shots.
Enter flipper code: (B-4L-R-L-R-4L-2R) when ball is in shooter lane to enable Secret Mania. Start Grandpa twice to begin the mode.