By smiling pick-thanks and base news-mongers."
The two last lines should, I think, be transposed.
"Mingled his royalty with carping fools."
The 4to, 1598, reads capring, i.e. capering. The choice is difficult.
Sc. 3.
"Go, Poins, to horse, to horse!"
Both 4tos and folio have Peto. Johnson made the change.