The Tigers slipped to their seventh defeat in nine home engage Super League games this season but referee Ian Smith was the centre of attention after a number of controversial decisions.
Chief among them were his failure to check two Catalans tries for possible infringements on the big screen and a penalty decision ahead of Dane Carlaw's decisive try.
Smith was booed persistently by home fans as a result and was escorted from the field by a steward after the game while there were claims some Dragons players were showered with beer by the crowd.
Matterson refused to condemn Smith outright but felt he should have called on the services of video official Phil Bentham more.
He said: "I don't understand why they don't go to the video.
"I can't see it (the screen] where I sit, so I'm not too sure, but if it's there you might as well use it.
"It is a bonus we get the video and TV. I just don't understand why they don't use it.
"But I don't really want to comment on the referee. I don't think that will do us any good."
Cas raced into an early 10-0 lead through tries by Brett Ferres and Richard Owen but the Dragons were level by the interval after replies from Dimitri Pelo and Jean-Philippe Baile.
Clint Greenshields and Carlaw then completed the fightback but Owen's second try left Catalans clinging on for a narrow win.
Matterson added: "The first 15 minutes were to plan but after that our ball completion went down.
"They are a good side and they capitalised on it but it is disappointing because that was there to win."