error in lessons

Question

in the lesson for preterit there is the following error:

Ambiguous Endings Need Clarification

The **3rd person** plural endings for -ar and -ir verbs are the same for preterit and present tenses. The tense must be deduced from the given context.

    * Siempre cocinamos paella los domingos. (We always cook paella on Sundays.)
    * Ayer cocinamos paella para mi familia. (Yesterday, we cooked paella for my family.)

Should be 1st person.

Answer 1

more errors:

http://www.spanishdict.com/answers/100046/preterit

**3rd Person Plural Change
The 3rd person singular of the J group is -eron and not -ieron.**

Answer 2

yes, I am referring to the reference section (spanish verbs).

Answer 3

Thanks! I am correcting all errors in the lessons over the next few weeks and actually opened up a thread where people can tell me about the errors that need fixing. Is this error in the video? Or is it in the reference article?