I came across several apparent errors and will add them to this thread as I see them again in review.
Most recently, in Allemand 5, Level 7 :
“Est-ce que tu veux voir mes photos?” is translated as “Wollt ihr unsere Fotos sehen?”.
The latter being plural, it should be changed to the singular “Willst du unsere Fotos sehen?”.
“Wollt ihr” would be “Est-ce que vous voulez” (plural familiar or singular/plural formal)