Wikipedia research
1. An actor may receive "last billing", which usually designates a smaller role played by a famous name. They are usually credited after the rest of the lead cast, prefixed with "and" (or also "with" if there is more than one, as Samuel L. Jackson was in the latter two Star Wars prequels). In some cases, the name is followed by "as" and then the name of the character. This is not the case if that character is unseen for most of the movie (see Ernst Stavro Blofeld).
2. "Salad days" is an idiomatic expression, referring to a youthful time, accompanied by the inexperience, enthusiasm, idealism, innocence, or indiscretion that one associates with a young person. More modern use, especially in the United States, refers to a person's heyday when somebody was at the peak of his/her abilities—not necessarily in that person's youth.
The phrase was coined in Shakespeare's Antony and Cleopatra in 1606. In the speech at the end of Act One in which Cleopatra is regretting her youthful dalliances with Julius Caesar she says:
"...My salad days, / When I was green in judgment, cold in blood..."
The phrase became popular only from the middle of the 19th century, coming to mean “a period of youthful inexperience or indiscretion." The metaphor comes from Cleopatra's use of the word 'green' — presumably meaning someone youthful, inexperienced, or immature.
Fowler's Dictionary of Modern English Usage summarizes several other possible meanings of the metaphor: Whether the point is that youth, like salad, is raw, or that salad is highly flavoured, and youth loves high flavours, or that innocent herbs are youth's food, ... few of those who now use the phrase could perhaps tell us; if so it is fitter for parrot's than for human speech.
3. A Judas goat is a trained goat used at a slaughterhouse and in general animal herding. The Judas goat is trained to associate with sheep or cattle, leading them to a specific destination. In stockyards, a Judas goat will lead sheep to slaughter, while its own life is spared. Judas goats are also used to lead other animals to specific pens and on to trucks.
The term is a reference to the biblical character Judas Iscariot.
The phrase has also been used to describe a goat that is used to find feral goats that are targeted for eradication. The Judas goat is outfitted with a transmitter, painted in red and then released. The goat then finds the remaining herds of feral goats, allowing hunters to exterminate them.
The phrase was also used in World War II by the 8th Air Force, U.S. Army Air Force B-17 Flying Fortress and B-24 Liberator crew members. Each bomb group employed a war-weary bomber known as a formation or assembly ship. These aircraft were brightly painted and decorated with individual psychedelic colors in stripes, checkers, or polka dots enabling easy recognition by their flock of bombers in order to form up from various airbases over England and fly strategic bombing missions over Europe.