Zale Parry and Leonard Nimoy have been mentioned. For a somewhat longer list, including episodes (where n.m = season.episode):
Zale Parry: 1.4 1.15, 1.33, 1.35, 2.9, 2.38 (6 episodes)
and reportedly as an uncredited diver or extra in 1.2, 2.4, and 2.29
Leonard Nimoy: 1.30, 1.33, 2.1, 2.15, 3.28, 3.30 (6 episodes)
Others of some note:
Larry Hagman: 1.18, 1.23, 1.26,
Robert Conrad: 2.6, 2.22
Ted Knight: 4.16
Jack Nicholson: 4.38
And Lloyd’s family:
his wife Dorothy: 1.28
son Jeff: 1.28, 1.32
son Beau: 3.29
(yes, the same Jeff and Beau who later became fairly famous actors)
Zale Parry: 1.4 1.15, 1.33, 1.35, 2.9, 2.38 (6 episodes)
and reportedly as an uncredited diver or extra in 1.2, 2.4, and 2.29
Leonard Nimoy: 1.30, 1.33, 2.1, 2.15, 3.28, 3.30 (6 episodes)
Others of some note:
Larry Hagman: 1.18, 1.23, 1.26,
Robert Conrad: 2.6, 2.22
Ted Knight: 4.16
Jack Nicholson: 4.38
And Lloyd’s family:
his wife Dorothy: 1.28
son Jeff: 1.28, 1.32
son Beau: 3.29
(yes, the same Jeff and Beau who later became fairly famous actors)
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