When the screen is showing the massive security code Data uses to lock command functions, the computer has both added and deleted numbers from the sequence.
How could Data gain full control of the bridge without Picard's personal authorization code? Impersonating his voice wouldn't be enough; the computer would still demand this.
When scanning the planet, the Enterprise should have been able to detect Data's positronic signal. Instead all the crew could detect was Dr. Soong.
Along the same lines as not getting readings of Data when scanning the planet, when Lore's ship arrives, Worf indicates there are no life forms aboard. Again, he should have been able to scan for Lore's positronic signal and confirm he was aboard.
Dr. Soong: I can answer your questions, questions to anything you'd ever want to know. You'll never get another chance, Lore, you see I'm dying. (Lore stops)
Data: Dying from what, sir?
Lore: What... what do you mean you're dying? You look fine. You're not that old... you look fine.
Lore: (singing) The sons of the prophet were valiant and bold, and quite unaccustomed to fear, but of all the most reckless, or so I am told, was Abdulla Bulbul Ameer!
Lore: Often-Wrong's got a broken heart, can't even tell his boys apart.
Lore: (after singing) I always loved that ditty. I could never quite get the cadence right. Thank you, Father.
Dr. Soong: You called me Father.
Lore: Well what would you prefer I call you? Often-Wrong?
Dr. Soong: I admit, I uh...I wouldn't have guessed I'd be running from a giant snowflake, but...
Brent Spiner appears in a remarkable triple-role, playing Dr Noonien Soong and Lore in addition to his regular role as Data. As such, body doubles were needed for the scenes in which all three appear, and extreme care was used to ensure that no camera shot featured the faces of more than one at a time.
Lore: (singing) The sons of the prophet...
The song Lore sings is Abdulla Bulbul Ameer written by William Percy French in 1877.
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