Thank you, kentix! I've just found the script in hereI couldn't find a script with those lines. And the movie is not on Netflix. So no way to double check. But there is definitely a problem. Even a small child would not make that mistake.
I've posted the link to Ponyprof, so I hope he or she can watch this clip to hear the sounds.I managed to listen to the clip. It's a small boy and he doesn't say the d clearly but he definitely says "I do". It just sounds like a normal lack of clear articulation in a smaller child who is excited.
My phone tends to seize up when I click on links out of here 😏I've posted the link to Ponyprof, so I hope he or she can watch this clip to hear the sounds.