The metronome that is shown 'counting the minute' that the people need to stay on the phone. A metronome is usually used for counting musical beats. Like 4/4 Time, 3/4 time. It's a musical thing, not chronographical thing. Anyone with any musical training in the least will laugh at this.
Background actor blue sweater leopard blouse keeps walking in front of camera which can be seen at
1:09 1:25 1:54 2:20 2:35 2:43
During the arcade scene, you can see several games in the background. Many of which did not exist during the time frame of this movie
. You can see an Area 51 cabinet, which did not hit arcades until 1995. There is also a Mortal Kombat 2 cab, which did not come out until 1993.