He's specific, and if he's right, and there's no reason to think he isn't, then this film is a travesty. If you enjoyed the books, or the radio plays, or the TV series, then I would suggest not destroying your fond memories.
The biggest crime is the fact that nowhere in this film is the Pan-galactic Gargleblaster mentioned. Not once.
Not being hit in the head with a gold brick wrapped in a slice of lemon? Unforgivable.
But then, it's made by Disney. It was always going to be butchered.