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I've never heard of followers, unless he means those who follow your progress. Always need those.
Bearings are what the rod/crank spin on, good to have high quality ones. Oiling system upgrades are nice to make sure everything is oiled. Meth injection cools the charge air and allows for more aggressive timing in tuning. Springs, guides, retainers, all head crap to improve the performance of the valves opening and closing, quickness to react, not necessary. The high output oil pump as stated above, good idea to improve oiling. Short block mods for oil feed line and tapping oil pan for oil return line.
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