Spurs have already qualified to play in Europe next season, for the UEFA cup. They won't qualify for the Champions League, and they won't get relegated. They really don't have anything to play for and seemed to be concentrating on just getting to the end of the season and then enjoying their summer holidays. The signs were there for all to see.
The commentator on the game was interviewing the assistant manager afterwards. He'd seen the signs and put it to the assistant. He denied this was the case. He mustn't have seen the signs...
Edit: check the advertising SIGNS