Even words that wouldn't usually be considered as tongue twisters can be difficult to get your mouth around when singing. It's partly about scansion, tempo, the combination with words surrounding the 'problem' one... Also, you have to sing with conviction and invest some emotion in the words. I can see how the highlighted ones could be tricky in that sense. In Domino, a picture/feeling of tension and impending doom is being built up, your singing has to convey that.... In the midst of which you have to convincingly emote "SHEETS OF DOUBLE GLAZING"!
I wonder if TB was trolling the then biggest pop star on the planet!
To his eternal credit, he (Phil) does a great job with the words.