The first time Michael's father tells Tara not to touch the clock, she has bangs on her forehead. However, when she turns round to stick her tongue out at Michael, her bangs are gone.
In 1989, the books "Clifford's Big Book of Stories" and "Clifford's First Easter: A Lift-the-Flap Book", both by Norman Bridwell, can be seen in the six-year-old Michael's bedroom. However, they were first published in 1994 and 1995 respectively.
When Michael is dreaming, he opens the door to the room the cuckoo clock is in and begins to scream. However, his scream is heard before his mouth opens.
If Tara was born in 1988, she would be 7 years old in 1995. So if Michael was 6 years old, Tara should already at least be a year old.