I don't think another official can, but yes the TD or marshal can overrule the group.
I know I've said this 100 times in posts on this site but I Feel like if I don't put it, then I just sound like someone just running their mouths.
I am a PDGA marshal and have marshaled the last two worlds and will again this summer.
I highly doubt we would ever overrule a call such as that unless it was insanely obvious that it was wrong. Our rules are written for players to make the calls and while we do have to have marshals to avoid certain situations, we don't like to interject our opinions. If the group can't make the call / doesn't want to, then our call is what stands.
I've been asked to make calls before by groups on IB / OB etc and I ask the group ahead of time their opinion. Sometimes they say "well we all pretty much think it's out and just want to make sure" and then I say "well I don't even need to see it then. it's out." Sometimes it's "we are split and just can't decide." At that point I Remind them that we want players to make calls and that if they want my opinion, it will automatically per rule overrule whatever the majority of the group thinks.
We also, getting back to the point of the question, have the right to overrule anything at anytime. I have done this a total of 1 time and I have probably marshaled 30 - 40 rounds of major competition. I have also had players make calls that required seconds and I agreed with them so I seconded them.
But I highly doubt I would ever overrule a foot fault call unless it was an interpretation of a foot fault - i.e. someone said that the foot fault happened because a secondary supporting point was behind the lie but not in line with the basket (which obviously only requires 1 supporting point). But as far as "um, I don't think he foot faulted" I doubt that would ever occur.
Contrary to popular belief, we aren't in the bushes look at people's feet each throw. The Marshals role is primarily be present, be available for questions, handle situations of inappropriate behavior and randomly step in when asked / needed.
