The extra vocabulary section includes these words: huanying, di'yi, danyuan, di'si, ke, Xiaci jian
Rocket Review quizzes us on the following: qingwen, keyi, dian, yinliao, you, Yingguo, Zhongguo, cha, yao, bei, yi bei, duo shao qian, yuan, shi, er shi, wu shi, gei, san shi, zhao
So, in addition to the 6 words currently in Extra Vocabulary, it would be helpful to include the 19 words and phrases given in Rocket Review.
Now I should note that lesson 1.9 "Out for Dinner and Drinks" also includes discussion on some of these topics, but I still think it would help us learn lesson 1.4 if you could beef up the extra vocabulary.
Lesson 1.4 "Ordering Drinks" Feedback - Extra Vocabulary

Robert-C7
April 30, 2014

Rocket-Languages
May 21, 2014
Hi Robert,
Thank you for your feedback. You have posted similar feedback on other parts of the forum, and here is a copy of our reply:
Hi Robert,
Thank you for your email and for your feedback - it is much appreciated. Unfortunately the words that are covered in the Rocket Review are not considered Extra Vocabulary, because they are all taken from the Conversation taught in that lesson. The aim of the Interactive Audio lessons is to teach conversations, so we have tried not to split things up too much, but obviously we wanted an Extra Vocab section for any words and phrases included in a lesson that were not taught in the conversation.
We can add your comments to a list of possible improvements to the course, to be looked into at a later date.
All the best!

Rocket-Languages
May 21, 2014
Hi Robert,
I thought you might like to know that we have added your suggestion of including the Rocket Review audio in the Extra Vocab to our To Do list. We have lots of other projects on the go at the moment, but as soon as we have some free time, we will get started on this task.
Thanks for bringing it to our attention.