Celta Vigo is very lucky that Barcelona did not play with a winning mission in the last match which allowed them to win that kept them away from the relegation zone. The defeat in the last game did not have a big impact on Barcelona even though their winning record was tarnished, Barcelona played only to meet the requirements as a sign that the season was over. An additional three points allowed Celta Vigo to stay in La Liga next season. Real Valladolid, Espanyol and Elche were relegated to Laliga Smartbank.
This is true. Barcelona didn't play that game like people who wanted to win. They just played it because they really had to and it has been like that since they won the league. The only thing they were really protecting was Ter Stegan clean sheet record and it would have been difficult for them to protect it even if they needed the win. They would have most likely win but Celta could have scored. They always score against Barcelona.
Celta were lucky indeed because if this was the match that they needed to stay alive and this was the match Barça needed to win the league, the Celta would have been relegated by now because Barcelona really wanted this league and nothing would have stopped them