The example from Scrabble manual have the following picture illustrating the scoring:
In the following, the words added on five successive turns are shown in bold type. The scores shown are the correct scores if the letter R is placed on the center square. In Turn 1, count HORN: in Turn 2, FARM; in Turn 3, PASTE and FARMS; in Turn 4, MOB, NOT and BE; in Turn 5, BIT, PI and AT.
But on turn 3 besides
PASTE the word
ARMS is also formed, but I don't see it scored. Also, on turn 2 only
FARM is scored while
ARM is also there.