1. The shirt.
2. Abe's stabbing.
Via m90indra.
The red on Megan's shirt also mirrors Abe's shirt after he's stabbed — blood red on white. And the incident also reflects the season's heightened violence. (Remember that Stan was casually stabbed in the arm just one week prior.)
3. The budding acting career.
4. The pregnancy.
Via madgiffing.
Sharon Tate was eight and a half months pregnant when she was murdered. Megan was pregnant earlier this season, though she had a miscarriage.
5. The marriage.
6. Rosemary's Baby.
7. The home invasion.
8. Don's absence.
Via m90indra.
Megan frequently complains about Don never being home. In the home invasion episode, Betty criticized him (and Megan) for leaving the children unattended. They won't be making that mistake again, but we surely haven't seen the last of Don leaving Megan to fend for herself.