Jessie Mueller is 14 years younger than Donnie Wahlberg while Amy Carlson (Linda) was one year older than Wahlberg.
While speaking to the survivors group, Frank states that Joe and Danny were 10 months apart, with Joe being the oldest, and that Erin was the baby. However, Donnie Wahlberg was born in 1969, Bridget Monahan in 1971, and Joe's headstone, seen in numerous episodes, clearly notes that Joseph Connor Reagan was born in 1977.
When the abusive stalking ex of the nurse pulled a gun on the receptionist at the hospital, she stood there and went to press the emergency button under the counter. She was shot before she could get to the button. She would have been better off dropping to the floor and climbing under the counter, and then pressing the panic button.