Horn, who didn't look dried out by any means, insisted he wasn't stressed by the incident but said he believed it was another part of a plan by the Top Rank, Crawford's promoter, to ensure their fighter left with the WBO strap.
"I had to go upstairs and have a hot shower for a few minutes. I wasn't stressed because I know exactly what their team wanted. I suppose someone dodgied up the scales because we were bang on, even under weight," Horn said.
"We tested on the official set from Top Rank. I think there was a few tricks up their sleeve. He was just under weight and I was just over. I thought I was under.
"I knew this was coming. I knew they had plenty of tricks in their book. I had to go up there for an extra 20 minutes. I think they think I'm mentally weaker than I actually am. This stuff is all part of it. I know it."
While some commissions use digital scales to get exact weights on fighters, Nevada does not, instead using an old-fashioned scale adjusted to half-pound increments.
Top Rank chief operating officer Brad Jacobs was swift to dismiss the suggestion, saying it was up to the fighters to make the weight and the scales were calibrated correctly and monitored around the clock.
"(It's) ridiculous. Scales are calibrated by the Nevada State Athletic Commission earlier in the day. They are watched by the Commission and security. It is what it is. Guys are overweight. It could have gone the same way for Crawford," Jacobs said.
Three fighters on the undercard initially failed to make weight but Jacobs said nothing could be read into it.
"It could be coincidence. Three fighters, that means 11 or 12 weighed in correctly."
Horn's plight drew little sympathy from a number of former greats including American Andre Ward, who collected belts at super middleweight and light heavyweight before retiring undefeated.
"It's a bad look especially when you're the champion, you've got to get a medical grade scale, a digital scale, you've got to have two or three scales to make sure you're right on," Ward said.
"I saw Crawford light up, every fighter wants their opponent to be overweight, 'I'm hydrating, I'm eating, you're still training yourself to make weight'.
"They said 'It's just 0.5 [pounds] but that's still a lot, that's another 30 minutes of sitting in the sauna."