Here are (to the best of my knowledge) all the Queen Anora mentions (and related Prince-Consort Warden mentions) that appear (or should appear but don't) in DA2.
The "Hero of Ferelden" codex entry, obtained at the start of Act 1, will read, if the Warden married Anora: "After ending the Blight, the Hero of Ferelden was wed to Queen Anora—he now bears the title of prince-consort."
In Anders' Act 1 "Tranquility" quest, Lirene says of either Alistair or a ruling Cousland, when questioned: "Only Fereldan Grey Warden I've heard of is sitting on the throne." If you talk down the threatening refugees outside Lirene's, they will end the conversation with "Maker bless the rule of our King Alistair" if Alistair is king and "Maker bless the rule of our Queen Anora" otherwise.
In Aveline's Act 1 "A Friend in the Guard" cutscene, if Cousland married Anora, Aveline should say of him: "A good family name. I've heard very little about him. He'll find a voice or be left behind." However, the line preceding that, "I loved that life, but there's a new king for a new Ferelden," only plays if Alistair is king, so the line is inaccessible.
When questioned about his past association with the Hero of Ferelden, Bodahn will say, if Cousland married Anora: "I hear that the hero is married to the queen, now. Fancy that! A Grey Warden ruling Ferelden!"
If Anora is queen, the bartender at the Blooming Rose should say, "The queen of Ferelden just made a state visit to Rivain. Can't imagine why. Not like Rivain's buying dogs." The plot flag, however, is bugged.
Corff, the bartender at the Hanged Man, has some niche gossip: "I heard the Hero of Ferelden married Queen Anora, but is keeping an elven lover. Scandalous" and "You hear about King Alistair of Ferelden? He has an elven mistress. Hope his queen never finds out."
The codex entry "A Study of the Fifth Blight, Vol. 2," which can be obtained in Act 2, is bugged to not fill out properly, and is missing at least one possible landsmeet outcome (Alistair kills Loghain, Anora and Cousland wed). If it did work, then depending on the worldstate, it would read: "Furthermore, the Landsmeet bore witness to the betrothal of Queen Anora to Alistair Theirin, the lost son of Maric," "Furthermore, the Landsmeet bore witness to the betrothal of Queen Anora to Teyrn Bryce Cousland's youngest son, who was one of the two Grey Wardens to survive Ostagar," or "Furthermore, the Landsmeet granted the vacant throne to Anora, widow of King Cailan."
If Alistair is a Grey Warden, you will receive his codex entry after meeting him in the Act 2 climax, which contains the line: "Rumor has it that he is an heir to the Fereldan throne, but that he turned it down in deference to Queen Anora, daughter to the traitorous Teyrn Loghain."
In Aveline's Act 3 "Questioning Beliefs" cutscene, she says of a Cousland married to Anora: "If the current king is wrong for the position, well, he's a Warden. They don't live long." If Alistair is on the throne and in an active romance with a Warden he is not married to, she says: "I understand King Alistair has proven adequate, although the queen seems to allow him certain… liberties in his company." This plays even if he is not married to Anora, although it shouldn't.
In Sebastian's Act 3 "Faith" quest, Leliana says of the Hero of Ferelden, if he married Anora and doesn't have an active romance with her: "He is a good king."
In King Alistair's Act 3 cameo, if Alistair is married to Anora and the Warden is his mistress, in response to Teagan's "You-know-who should already have returned from her mission," Alistair says, "Is she? Well! Let's not tell the queen, then." If he is married to Anora then this version of his codex entry, which you receive after the meeting, reads: "Few Wardens have ever left the secretive order, and he is the only of those who went on to rule a nation; Queen Anora, daughter of the legendary Teyrn Loghain, rules at his side."