In his comment on my first Sal Trapani post, Mark Evanier mentioned the artist's work on DC's Metamorpho containing many swipes from Ramona Fradon's earlier work on the title. The example that hit me when I then reread the series was the figure of Simon Stagg that Trapani swiped three times. The first detail here is from Fradon's cover to issue 5 (Mar-Apr/66). She stopped doing story art with issue 4, but continued with the covers, as far as I can tell, through 8. The next three details are from the stories in 11 (Mar-Apr/67) and 12 (May-June /67) and a contest page in 15 (Nov-Dec/67). The inker on the cover and story pages is Charles Paris; Trapani may have inked himself on the contest page.
Booksteve posted on his blog a Trapani Metamorpho swipe from a Jack Kirby Captain America panel. In my comment I cited swipes from Kirby's Fantastic Four. To illustrate with the correct FF story (my memory was off by a couple of issues), here are details from FF 65 (Aug/67) and a tier from that Nov-Dec/67 Metamorpho 15. The Metamorpho dialogue is by Bob Haney.
The Kirby swipes in this issue are limited to the sequence of Metamorpho and Element Girl in a sub-atomic world, including the page and a half before this one.
The rest of the issue you could take for Trapani actually pencilling for himself—I don't offhand see any more Fradon swipes—but I wonder if I don't see some of Bill Fraccio's style there, as in Dell's Super Heroes where he ghosted for Trapani. This bears further looking into!