The posters featuring the Rigelian language, seen in "Broken Bow", were previously seen on the Mokra planet in VOY: "Resistance".
Hoshi Sato could understand Rigelian, but was knocked unconscious before she could make out what a trio of Rigelian kidnappers were saying about their plot to kidnap DoctorPhlox. (ENT: "Affliction")
In 2155, during the talks leading up to the formation of the Coalition of Planets,six of the universal translators started confusing Rigelian with Andorian, a glitch that proved hard to track down. (ENT: "Demons")
"Rigel 113 language" was referred to in the first draft script of TOS: "The Cage", in which Vina used it in a simulation of Rigel 113 (later renamed Rigel VII), while frightened by a Kalar. The scripted dialogue included the statement "Vit meon! Tekos!", meaning, "Help me! Please!" The dialogue also made it clear that Rigel 113 language included the name "Kalar", despite that name also being used (with the same meaning) in English.