Here's a general overview that should help (If I'm wrong about these rules, please tell me):
- Normal Buildings only give Planetary Bonuses. The Cathedral of Valor is the sole exception, but I believe it isn't even properly working anyway

- Trade Goods are ALWAYS Galactic-Wide bonuses. Always.
- Most Galactic Achievements are Galactic-Wide. Many Galactic Achievements are worded oddly or unclear about what type of bonus it is (Restraunt of Eternity is Galactic-Wide...), though.
- Many Super Projects give Galactic-Wide bonuses. All the "Capital" Super Projects are Planetary Bonuses, though. Super Projects are generally pretty clear about the scope of their effect.
- If it says "Bonus" it's probably Planetary. IE: "Research" is Galactic-Wide, but "Research Bonus" is Planetary. However, "Social Production Bonus" is Galactic Wide, not Planetary...
- "Economy" is Planetary, "Economics" is Galactic.
However, in the XML (Data/English/PlanetaryImprovements.xml is the one you want to look at) you want to look for <AbilityType> and <AbilityAmount> tags (The Mind Control Center is missing a <AbilityType> tag, but it defaults to 0 (Economics). You can look here to find out what each ability is numbered). If those two tags are listed, then the bonus is Galactic-Wide. An improvement can only have ONE set of these tags (I believe), so it is giving out mutliple bonuses, only one of them is Galactic-Wide.
Otherwise, the bonus is Planetary (Note: Prestige is Planetary Influence, Resistance is Planetary Loyalty).
Hope that helps.