Edit - since I have found more errors throughout the Telvannis District, I will update this with bugs from the entire district.

• The topic "specific place" in Firewatch suggests that "the docks offer travel to Bal Oyra and Tel Ouada" for three out of the four different responses. This seems to be a remnant from an older version of Tamriel Rebuilt. At least if using TR_Travels, there is no travel connection between Firewatch and Tel Ouada, so this should be updated accordingly.
• The name of the Legion Captain is mispelled in all of the responses to "someone in particular" that are mentioning her in Firewatch. Her correct name is Herdonia Varan, but this is either misspelled as "Herdonia Varian" or written as "Herdonia Brandt" (obvious mix-up with the Fighters Guild champion).
• When asking about the topic "Bal Oyra", the local residents refer to it as sitting on the northern coast of Molagreadh Region. With the current region assignments however, it is located in Boethiah's Spine Region.
• When asking one of the mainland Telvanni councilors about "House Telvanni", they will tell the player that their Mouth can be found in Sadrith Mora (this response might be overridden for some councilors, but at least not Mistress Rathra). This needs a TR specific response.
• The topic "someone in particular" filtered for Irele Nathryon (TR_m1_Irele_Nathryon) has a typo, "our hear" should be "our healer"
• When asking Teris Sevuro about "mainland", he will tell the player that Lan Orethan is "the garden of the whole province", where Almalexia is located. However, given the current region assignments, this should be changed to Alt Orethan.
• For Hasilius Brahn (TR_m1_Hasilius_Brahn), the different responses to the topic "Solstheim" have the wrong order in the dialogue list, making his sober response appear on top of the drunk one. These should be reversed, otherwise he will always use the sober response.
• The topics "fire salts", "frost salts", "void salts", "Daedra skin", and "Scamp skin" are lacking speaker conditions for Malvas Relvani (TR_m1_T_Malvas_Relvani). He asks the player to fetch these ingredients for a quest, but if you have not yet got this quest from him (or are not a member of House Telvanni), he will still give the quest specific responses to these, which appears weird.
• East and west have been reversed for several of the directions given in Port Telvannis. This is the case for the topics Llothanis ("southeast" should be "southwest" in two responses, "west coast" should be "east coast" in one), Tel Ouada ("east" should be "west" for two responses), and "specific place" ("eastern end" should be "western end" for one response).
• Thalen Thimalvel (TR_m1_Thalen_Thimalvel) should have a unique greeting. Now she is just using the generic Ashamul greetings, indicating that she would be happy to get a visitor, but given how she is responding to various topics, it is clear that the player is not at all welcome into her home.
• For Staron (TR_m2_Staron), the wrong filter is used for the Dunmer specific response to the topic "Rihad". It is filtered for Not Race: Dark Elf, where it should be filtered for Race: Dark Elf.
• The response to the topic "Nerevarine" for Adrosu Balmayn (TR_m2_Adrosu Balmayn) is "What's that?", which would be impossible for him to prononce given that he has lost part of his tongue. I think this should be changed to be more in line with his other responses.
• There are two typos in the response to the topic "local area" for Manibia Eretan (TR_m2_Manibia Eretan). "The isn't" should be "There isn't" and "inbetween" should be changed to "in between".
• There is a typo in the general response to "local area" in Alt Bosara. Lake Boethiah is northwest of this village, not northeast, and the response should be changed accordingly.
• The topic "Yishini" (last entry in the queue) has misleading directions. The shrine of Boethiah is located southeast of the west exit of Llothanis, not southwest of it.
• Drithnil Virith (TR_m2_Drithnil_Virith) seems to have confused the ghostfence with Ghostgate in his response to "my trade". It is after all the ghostfence that contains the blight within Red Mountain, which I think he should be aware of.
• In her Greeting 7, Lielle Veris (TR_m2_Lielle Veris) welcomes the player to Lariast's store. But the store belongs to Cervius Veris, whom she is married to.
• There are several typos in Hvalesa Llenim's (TR_m2_Hvalesa Llenim) dialogue. In "local area", "The are" should be "There are"; in "Alt Bosara", "it's" should be "its" (first occasion). The topic "know my route" has quite weird statements overall and it doesn't really add up. To begin with, "Sailen" needs to be changed to "Firewatch", but I think the entire topic should be rewritten.
• In the topic "Background", Proximus Munus (TR_m2_Proximus Munus) says that he has visited Kragenmoor. Even though he is an Imperial, this should be updated to the name that is used in-game, namely Kragen Mar.
• There is a typo in the topic "latest rumors" for Heleran Vela (TR_m2_Heleran Vela), "removed location" should be "remote location".