On the first page is Yukino (Yamada-dad) being overprotective, trying to butt in on the phone call?
And on the third page – I think it's implied that Yamada used Ichikawa's shampoo here. I wonder if Yamada is remembering the events of extra for chapter 43, when Ichikawa used Kana's shampoo by accident?
This chapter was adapted as part of the anime episode 20. The announcement for the episode (extra chapter 139.2) also showed Yamada's underwear with two dots on the front, like page 6 and the extra page 13 of this chapter.