It appears a decent number of folks were able to catch a sneak peek of the highly-anticipated film ... including several Twitter users, who were quick to rub it in and crack jokes about staffers getting fired.
While HBO Max says the error was fixed "within minutes," some people say they were able to watch about an hour of the film before the feed was cut.
Snyder's version of the 2017 flick isn't set for an official release until March 18 ... so this is a pretty big oops.
But, this may end up driving more eyeballs to HBO Max, even if some got there way too early. As they say, all publicity is good publicity ... even the major oops kind.