The lucky ones that did advance include dancer Beth Ann Robinson, bicyclist Matt Willheim, circus performers Gymkana and singer Kevin Colis.
Morgan pretty much sealed the fate of agile tumbler Breena Bell when he gave her a strike on Tuesday's show.
Why'd he do it?
Could it be because host Nick Cannon told Morgan that he'd be "truly evil" if he buzzed the pre-teen contortionist?
"It makes no difference to me," muses Morgan. "That's not why I buzzed her. But at this stage of the game you have to be fair. That little girl is a talented gymnast, but, to me, it's not a semi-final act. It doesn't matter if Nick thinks I'm 'evil' -- it's just the truth."
Not surprisingly, Morgan disagreed with Mandel striking Powerhouse, the show choir from Burbank.
"The question was, 'Did they make me happy?' Oddly, they did."
Five strikes for the night from Morgan was high but, as always, the talk show host stands by each and every one.
"You have to be careful with the YouTube.com contestants," he cautions. "You want to send a signal to America that this is who we think should go through. You want to limit the range."
Mandel likewise stands behind his decision to strike the 'Glee'-inspired high school singers.
"These are people competing to be million-dollar headlining professionals," Mandel says. "That certainly was not a million-dollar headlining professional act.
"I let most people play out," Mandel adds. "There are some I'm not on the fence about -- I liked Aeon. It's kind of cool."
Surprisingly, West Springfield Dance Team didn't make it through to the semi-finals -- at least not yet. Judge Sharon Osbourne revealed she intends to select them for her Wild Card pick.
"I love West Springfield Dance Team," Osbourne enthuses. Her one critique is that she feels that the group does need to change its name. "It's not representative of who they are."
So why doesn't Osbourne use her buzzer very often?
"These guys are all amateurs apart from the magician. Why not give them their 90 seconds? Whynot?
'America's Got Talent' airs Tuesdays and Wednesdays, 9PM ET on NBC.