No, not a plot hole.
Maybe Freddie had heard that The Master had set up in England. Maybe he'd read it in a newspaper. Maybe he'd overheard it somewhere subconsciously. The fact that The Master wanted some Kools is no stretch. Freddie knows that he likes them and being a world traveler he know that you can't get them in other countries. It is a logical guess that The Master would miss them.
So Freddie had a dream. He wanted an excuse to see The Master and his subconscious provided an excuse.
That is not a plot hole. A plot hole is something that is impossible. This is possible. Just because every single point is not explained does not make it a plot hole. The fact that the writer didn't connect all the dots for us does not mean that it is a plot hole. It just means that the writer respects the intelligence of the audience.
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