They flew to the fury of defensive backs who insisted they did nothing wrong and to the amusement of some of those receivers who benefited from the calls that are part of the NFL's added emphasis on defensive holding and illegal contact.
The practice was reminiscent of many preseason games this offseason -- and even to the receivers who benefit, that isn't always a good thing.
The excessive calls were a little annoying to Texans receiver Andre Johnson.
"It kind of makes the game longer," Johnson said. "It actually kind of makes you hate it a little bit.
"Every time you look around, there's a flag on the ground. It's football. It's a contact sport. Everything's not going to be perfect, you're going to get bumped around a little bit."
Johnson believes those calls won't be made so frequently once the regular season begins. One way or another, though, this is giving the Texans' defensive backs a chance to have a better understanding of what officials are looking for.
"We had a few flags today and we asked them what it was, what it was they threw the flag for," safety D.J. Swearinger said. "They gave us some pointers on what to do and what not to do. It's just a part of the game."