"I think that you can see that there's teething problems that they would have had had they not done that [the pilot]," he explained.
"It was a very smart move to do that and to make sure everything was good for when they started season one.
"So obviously smoke coming from behind Thomas's face plate, and I know that, having talked to some of the crew that worked on it, they had problems with the radio control devices not getting through the actual engine builds."
He added: "But I think there's a sort of a lovely charm and innocence about it, and I think even as a pilot, as a test piece, it still has that lovely, classic, timeless story to it, and the voices, everything is just so delightful."
Thomas first appeared on ITV before moving to Cartoon Network, Nick Jr, Channel 5 and can now be found on Netflix.
McCue attributes the show's enduring popularity to its evolution over time while maintaining themes of friendship and teamwork, aligned with its trustworthiness for parents.
"Over the years, it's built up this amazing fandom, but we keep thinking about our next generation of Thomas fans, and keep it relevant for today," he said.
"But we always remember the themes, the messages of friendship and teamwork and communication, and just make sure they're just fun, wholesome adventures and it's a trusted show.
"I think parents actually enjoy the fact that they could leave their children to watch Thomas without any concern."