When the original emotions are in the back of Riley's mind with all the suppressed memories of negative experiences, several gold ones can be seen strewn about mixed in with the rest. Gold represents joyful experiences, they wouldn't suppress joyful memories, particularly seeing as it's been Joy herself choosing which memories to suppress.
Val is the Captain of the Bay Area Fire Hawks. However, her jersey does not have a "C" on it. In reality, captains of hockey teams have a "C" on their jersey (or an "A" if there is more than one captain).
As Riley gets older, her feelings are more complex, and therefore new characters (emotions) are introduced. However, wouldn't this mean that her parents (and potentially other adults), who have matured and developed even more, would not only have those emotions in their control rooms, but even more emotions? There is a flash of Anxiety during the mid-credits scene with both parents, but nothing else. Are those emotions being suppressed? Or hidden away like Riley's
Nostalgia? Such was also the case in the previous film, when the adults' control rooms appeared as developed as that of the kids, and had the same number of emotions.