I am very surprise not because Cadiz is about to get a draw from Villareal, I am surprised why Cadiz will just prepare and train for a match only to come for a draw. Did they come with the idea that draw is better than lose? Atleast they would have made some efforts to get a goal, having a draw will not help to lift them off from the bottom. They will still be in the bottom region even after getting a draw.
Villarreal is a strong enough team and Cadiz is getting points at home for the first time. It's natural for them to think that 1 point is enough. Towards the end of the match, they wanted to keep this score as they went without conceding a goal for a long time.
The red card in overtime was very clever. Carcelen blocked the clear goal position and received applause from the fans. It's not common for a red card to be applauded. It was an interesting situation.
Getting a point against Emery's Villarreal should count as success. Cadiz can play against teams similar of their quality to win the match. It's their nature to be protective against big teams.