Multiple-word answers were common, however, the Double Trouble category took away the ability to be credited for cluing for each word individually until the receiver said the two-word phrase. For example, under the standard gameplay rule, you could have the receiver answer "Palace" and then "Buckingham," and you were immediately given credit (the order did not matter). However, in Double Trouble, they would not count it correct until "Buckingham Palace" was said.
John Davidson often implored players to give clues for the full phrase, rather than one word at a time, particularly if a team did poorly. (Fine if the answer is "peanut butter," but if it's "rocking chair," I'm going "another word for stone, another word for seat.") That strategy session from the host was essentially useless, because that player would not play Double Trouble for the rest of the episode.
The other odd departure was that each team was compelled to select one of the Double Troubles (for obvious competitive reasons). JD also suggested teams "get it out of the way early," but I would chance that the other team bombs out on their DT. Then, if I chose 4th, the other team is forced to take the remaining standard category they may not want, leaving me with 45 seconds for a partial DT category (and, maybe, the ability to pass).
And, that 45 seconds just seemed to mix up the pace too much.