After the 1st visitors run from the Museum, H.R. goes toward the glass door after them just as Julian arrives. H.R. thinks it is another visitor but sees it is Julian. Then H.R. exclaims "it's Julius!" However, H.R. has a history of mangling the other characters' names (i.e., referring to Wally as "Walter"), so this is in keeping with his character.
When Wally confronts Plunder at the Museum, as Plunder speeds away there is a camera man hiding in the bottom right corner, clearly visible.