El final de la película me hizo pensar.

Because final here is a noun, meaning ending or final part, and it is masculine: el final.

Compare:

• el final = the ending
• la final = the final match / the final round

So in El final de la película, it means the ending of the film, not the final in the sense of a competition.

De means of, so el final de la película literally means the ending of the film.

This is a very common Spanish structure:

• el título del libro = the title of the book
• la puerta de la casa = the door of the house
• el final de la película = the ending of the film

Spanish usually uses noun + de + noun where English often uses noun + noun or possessive.

Me means me and shows who was affected by the action.

The structure is:

• hacer + infinitive = to make someone do something
• me hizo pensar = it made me think

More examples:

• Me hizo reír. = It made me laugh.
• Me hizo llorar. = It made me cry.

So me is the person who was made to think.

This is a very common Spanish pattern:

hacer + person + infinitive

It means to make/cause someone to do something.

In your sentence:

• hizo = made
• me = me
• pensar = think

So:

• me hizo pensar = made me think

Other examples:

• La noticia me hizo sonreír. = The news made me smile.
• Ese libro me hizo cambiar de opinión. = That book made me change my mind.

Hizo is the preterite form of hacer, used for a completed action in the past.

Here, the speaker is talking about a specific reaction:

• The ending made me think

That reaction is seen as a complete event, so hizo fits well.

Compare:

• me hizo pensar = it made me think, as a completed event
• me hacía pensar = it used to make me think / it was making me think

So hizo is the natural choice if the speaker is talking about one finished experience.

Because after hacer in this pattern, Spanish uses the infinitive.

Structure:

• hacer + infinitive

Examples:

• me hizo pensar = made me think
• me hizo dudar = made me doubt
• me hizo reflexionar = made me reflect

You do not conjugate the second verb here. The only conjugated verb is hizo.

Because in Spanish, after hacer, you normally go straight to the infinitive.

English says:

• made me think

Not:

• made me to think

Spanish works similarly:

• me hizo pensar

Not:

• me hizo a pensar

So there is no a or other word inserted before pensar.

Yes, but El final de la película me hizo pensar is the most neutral and natural order.

Spanish often uses:

• subject + indirect object pronoun + verb + infinitive

So:

• El final de la película = subject
• me = to me / me
• hizo pensar = made think

You could also say:

• Me hizo pensar el final de la película

But that is less neutral and may sound more marked or literary depending on context. For everyday use, the original sentence is the best choice.

With a conjugated verb plus an infinitive, object pronouns usually go before the conjugated verb:

• me hizo pensar

In many cases in Spanish, pronouns can also attach to the infinitive:

• hizo pensarme

But in this specific case, pensarme would usually mean something different, like to think about me or it would sound unnatural here.

So for made me think, the correct and natural form is:

• me hizo pensar

It can mean both, depending on context.

In me hizo pensar, the idea is often stronger than just it caused a thought. It often suggests:

• it made me reflect
• it made me think deeply
• it got me thinking

If you want to be more explicit, Spanish can also say:

• me hizo reflexionar = it made me reflect

But me hizo pensar is very natural and common.

Because pensar can be used on its own when the idea is general:

• me hizo pensar = it made me think

If you want to add the topic, Spanish often uses en:

• me hizo pensar en mi infancia = it made me think about my childhood
• me hizo pensar en la vida = it made me think about life

So the original sentence leaves the thought open and general, which is very natural.

Very often:

• pensar = to think
• pensar en = to think about

In this sentence, pensar is used generally:

• me hizo pensar = it made me think

If the speaker wanted to mention the subject of those thoughts, they would usually add en:

• me hizo pensar en muchas cosas = it made me think about many things

So the sentence is complete without en, but en would be needed before a specific topic.

Película has a written accent because the stress falls on the pe syllable:

• pe-LÍ-cu-la

Without the accent, standard Spanish stress rules would make you read it differently.

The accent mark shows the correct pronunciation and stress. This is very common in Spanish and important to learn early, because accents are part of the correct spelling of the word.

Yes. La peli is a very common informal short form of la película in Spain.

So you might hear:

• El final de la peli me hizo pensar.

This means exactly the same thing, but it sounds more casual and conversational. The full form la película is more neutral and works in all contexts.