I should have mentioned this the other day, but Holmes includes no rules for intelligent swords in the Blue Book. Moldvay follows his lead on this, relegating such rules to the Cook/Marsh Expert Rulebook.
Holmes's ring of invisibility follows OD&D. However, he changes the LBBs' ring of mammal control to a ring of animal control. The ring controls the same number of animals as in OD&D but the scope of its power has been broadened. His ring of plant control is seemingly unique, having no counterpart in OD&D that I can find. The ring of weakness in the Blue Book is slightly different, being clearer in its mechanical function and possessing a 5% chance that it works in reverse. The ring of protection and ring of three wishes both function as in OD&D, right down to the injunction to the referee to use the latter as a means to punish greedy players who attempt abuse its magic. Likewise, the ring of regeneration, ring of water walking, and ring of fire resistance follow OD&D, though Holmes actually provides descriptions for the latter two rather than simply referring the reader to spell descriptions. The ring of contrariness follows Greyhawk.
Holmes follows OD&D when it comes to the general powers of wands (6d6 damage and 100 charges). He doesn't make reference to how many charges staves have, however, which is odd, particularly since Supplement I clarifies that even the staff of striking uses charges to function. He provides a duration for the fear engendered by a wand of fear, while his wand of magic detection and wand of secret door and trap detection follow OD&D except to convert inches to feet for range purposes. His other wands also follow OD&D, although the wand of fireballs gets a lengthier description that repeats some of the details of the fireball spell on which it's based, presumably because Holmes doesn't include such a description earlier in the book. Holmes's staves all conform to their OD&D antecedents. The rod of cancellation, meanwhile, is generally the same as in Supplement I, but Holmes adds that "the character employing the rod adds 2 to his die roll to score hits," a sentence not found in Greyhawk.
The crystal ball, medallion of ESP, and bag of holding follow OD&D. The elven cloak still only makes the wearer "next to invisible," but there are explicit rules for how the wearer can be seen. Elven boots are unchanged. The broom of flying is more specific about its speed with two riders but is otherwise unchanged. The helm of telepathy is roughly identical to OD&D, but the game mechanics are different, with the LBBs using the random monster action rules and Holmes employing a straight saving throw. The bag of devouring follows Greyhawk. The helm of chaos (law) is now called helm of evil/good and functions according to the fivefold alignment system. The helm also turns a Neutral character into someone "totally self-seeking" as opposed to OD&D's notion that the helm makes them become either Lawful or Chaotic, which suggests yet another shift in the meaning of alignment from the LBBs to Holmes. The rope of climbing from Supplement I is here and gets a lengthier and more detailed description of its powers. Gauntlets of ogre power more or less follow OD&D, though the range of damage dealt is slightly different (2-8 rather than 3-8) and Holmes riffs off the exceptional strength table (though does not follow it) by granting the wearer of the gauntlets the ability to carry more weight.
Holmes concludes his discussion of magic items by noting that the referee should penalize any character who "has a hireling or non-player character flunkie try out a newly found piece of equipment" out of fear for its possibly harmful effects. He suggests that such NPC guinea pigs "demand to keep [a magic item] if it proves to be beneficial" and will seek revenge if the opposite is the case.