Splash page to AVENGERS #166 by John Byrne and Pablo Marcos
A page from AVENGERS #164 by John Byrne and Pablo Marcos.
You can see that the fifth panel was cut out of the board and changed.
The last page from AVENGERS #162 by George Perez and Pablo Marcos.
You can see that the next to last panel of the page was cut out and replaced by this new close-up of the Black Panther. No idea what it had been before. But corrections in those days were frequently done by cutting up the boards themselves.