MacGyver

No such conjunction of planets occurred anytime between 1962 and 2000. Even if it did, the gravitational force of any of the bodies involved other than the Moon would be non-existent, as mass and tidal force depends on the square and cube of the distance, respectively. All of the planets combined would at best only have a gravitational pull of 1.698% that of the Moon, or a tidal pull of .00575% of the Moon. This wouldn't affect volcanoes on Earth prior to the arrival of the Hecate meteor, as is shown here.

MacGyver asks who the "fella" is pictured on the Ark case at the academy, and Kelly identifies the representation as Hecate. Hecate is a female goddess.

MacGyver needs to relight a candle after accidentally blowing it out, but the close-up shows him lighting a clean, unused wick.

As MacGyver and Sam prepare to ride off, Pete waves to them, the blind Dana Elcar being unaware that their backs are turned.

The motorbike Sam rides through a window loses and regains its rack during the sequence.

The character "Robo" from "The 'Hood" is here referred to as "Lobo" and is now white instead of black. However, the two artists have the exact same graffiti style and are on probation.

Morganna is mixing her gunpowder, and uses proportions of 20 to 7 to 1. The proportions typically have to be 7.5 sulfur to 1.5 charcoal to 1 sulfur. Also, the substance she has marked as 7 is white, but charcoal wouldn't be white. And the substance she has marked as 1 is black, but sulfur isn't black.

The slat that MacGyver is holding onto with both hands is shown to splinter in the middle at the end of the previous episode, and in the recap at the beginning of this episode. However, when the episode actually starts, it is undamaged.

This episode finally reveals MacGyver's first name: Angus.

There is not enough volume in the wineskin to contain sufficient hydrogen to lift it off the ground, much less bear the weight of the kite and cloth.

The guard calls Morgana "Your Highness", but since she is a queen, she should be addressed as "Your Majesty".

When Prometheus calls the first time, he tells them to go to an abandoned hotel to view his work and doesn't mention any other buildings. However, the building where the bomb actually is located at is a clothing warehouse. The fire department searches there first and finds the bomb. The hotel is across the street and it is later revealed Prometheus is hiding there. If the fire department had gone to the hotel as Prometheus directed, they would have captured him and not found the bomb.

When MacGyver runs Murdoc's phone number through a reverse directory, the same number (213-555-7836) is shown at two different addresses.

When the police sergeant calls Mama Lorraine to tell her that Kelly is at the theater, he clearly identifies himself as "Sergeant Lee". However, he is identified in the end credits as "Sergeant Rudley."

When arriving at Sherman's, MacGyver parks parallel to a curb with parking spots that are clearly marked for 45° parking.

The notes that Connie sends to Pete refers to him as "Peter," which he hates. She also refers to him that way when she arrives at the hospital. However, in "Family Matters" she called him "Pete" constantly from the moment they were reunited.

Pete's ex-wife claims the Phoenix Foundation was more important than his family, which can't be true since they'd been divorced before Pete worked for the foundation.

A car that explodes, complete with shattering glass, is seen just after to be undamaged, save for a small hood fire.

The criminals wasted tons of time on doors, eventually setting on crashing a car through a wall, when there was tons of windows that could have been smashed.

After the security guards arrest MacGyver, they put him in the back seat of what is clearly a police car. However, there is no cage separating the front from the rear, and the rear doors have easily-accessible push locks.